# Grouping and aggregation

## 1. GroupBy object

#### ·Parameters in the groupedby function:

```The function of as'index: controls whether the group label is the index value of the aggregate output. The default value is True, which is the hierarchical index. If it is False and one more column of the default index, it is equivalent to sorting non other data.
But what's the difference between the two sets of label index values? ===The purpose is to determine whether a column is an index column.
sort_values: sort the selected column of numerical data from top to bottom, from small to large (if the value transfer is not successful = = = set ontology coverage, value transfer coverage)
```
```import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.pyplot
%matplotlib inline
```
```dict_obj = {'key1' : ['a', 'b', 'a', 'b',
'a', 'b', 'a', 'a'],
'key2' : ['one', 'one', 'two', 'three',
'two', 'two', 'one', 'three'],
'data1': np.random.randn(8),
'data2': np.random.randn(8)}
df_obj = pd.DataFrame(dict_obj)
print (df_obj)
```
```  key1   key2     data1     data2
0    a    one -0.147612 -0.348087
1    b    one -0.992986  0.902458
2    a    two  0.547541 -0.310040
3    b  three  0.458871 -1.895392
4    a    two  1.224041  0.220150
5    b    two -0.200124 -1.562237
6    a    one  1.539144 -0.758716
7    a  three  0.385845  0.074309
```
```'''1. dataframe according to key2 Grouping'''
print(df_obj.groupby('key2')['key1'].count())

print (type(df_obj.groupby('key1')))
#No visual output
```
```key2
one      3
three    2
two      3
Name: key1, dtype: int64
<class 'pandas.core.groupby.generic.DataFrameGroupBy'>
```
```'''2. Specify column by key1 Grouping'''
print (type(df_obj['data1'].groupby(df_obj['key1'])))
```
```<class 'pandas.core.groupby.generic.SeriesGroupBy'>
```
```# Grouping operation
grouped1 = df_obj.groupby('key1',as_index=False)
print (grouped1.mean())

grouped2 = df_obj['data1'].groupby(df_obj['key1'])#Specifies that the data of a column is grouped and aggregated under the index
print (grouped2.mean())
```
```  key1     data1     data2
0    a  0.709792 -0.224477
1    b -0.244746 -0.851723
key1
a    0.709792
b   -0.244746
Name: data1, dtype: float64
```
```'''3. Customize key Group, list'''
self_def_key = [1, 1, 2, 2, 2, 1, 1, 1]
df_obj.groupby(self_def_key).mean()
```
data1 data2
1 0.116853 -0.338455
2 0.743484 -0.661761
```df_obj
```
key1 key2 data1 data2
0 a one -0.147612 -0.348087
1 b one -0.992986 0.902458
2 a two 0.547541 -0.310040
3 b three 0.458871 -1.895392
4 a two 1.224041 0.220150
5 b two -0.200124 -1.562237
6 a one 1.539144 -0.758716
7 a three 0.385845 0.074309
```'''4. Group by multiple columns = = = By list'''
grouped2 = df_obj.groupby(['key1', 'key2'],as_index=False)
print (grouped2.mean())
print('--------compare asindex Difference-------')
grouped2 = df_obj.groupby(['key1', 'key2'],as_index=True)
print (grouped2.mean())
```
```  key1   key2     data1     data2
0    a    one  0.695766 -0.553401
1    a  three  0.385845  0.074309
2    a    two  0.885791 -0.044945
3    b    one -0.992986  0.902458
4    b  three  0.458871 -1.895392
5    b    two -0.200124 -1.562237
--------compare asindex Difference-------
data1     data2
key1 key2
a    one    0.695766 -0.553401
three  0.385845  0.074309
two    0.885791 -0.044945
b    one   -0.992986  0.902458
three  0.458871 -1.895392
two   -0.200124 -1.562237
```
```# The multi-level grouping is carried out in the order of key = = = the function of the selected column data is the same as the above asindex, which is the difference
grouped3 = df_obj.groupby(['key2', 'key1'])
print (grouped3.mean())
print ('=============================================')
'''PS: If you want to group and aggregate by column === unstack===You can also use transpose'''
print (grouped3.mean().unstack())
```
```               data1     data2
key2  key1
one   a     0.695766 -0.553401
b    -0.992986  0.902458
three a     0.385845  0.074309
b     0.458871 -1.895392
two   a     0.885791 -0.044945
b    -0.200124 -1.562237
=============================================
data1               data2
key1          a         b         a         b
key2
one    0.695766 -0.992986 -0.553401  0.902458
three  0.385845  0.458871  0.074309 -1.895392
two    0.885791 -0.200124 -0.044945 -1.562237
```

## GroupBy object group iteration = = = "traversal"

```grouped1
```
```<pandas.core.groupby.generic.DataFrameGroupBy object at 0x000001AF5B5F9088>
```
```# Single layer grouping
print("------------------------------------Dividing line------------------------------------------")
for group_name, group_data in grouped1:
print (group_name)
print (group_data['data1'])
```
```  key1   key2     data1     data2
0    a    one -0.147612 -0.348087
1    b    one -0.992986  0.902458
2    a    two  0.547541 -0.310040
3    b  three  0.458871 -1.895392
4    a    two  1.224041  0.220150
5    b    two -0.200124 -1.562237
6    a    one  1.539144 -0.758716
7    a  three  0.385845  0.074309
------------------------------------Dividing line------------------------------------------
a
0   -0.147612
2    0.547541
4    1.224041
6    1.539144
7    0.385845
Name: data1, dtype: float64
b
1   -0.992986
3    0.458871
5   -0.200124
Name: data1, dtype: float64
```
```# Multilevel grouping
for group_name, group_data in grouped2:
print (group_name)
print (group_data)
```
```('a', 'one')
key1 key2     data1     data2
0    a  one -0.147612 -0.348087
6    a  one  1.539144 -0.758716
('a', 'three')
key1   key2     data1     data2
7    a  three  0.385845  0.074309
('a', 'two')
key1 key2     data1    data2
2    a  two  0.547541 -0.31004
4    a  two  1.224041  0.22015
('b', 'one')
key1 key2     data1     data2
1    b  one -0.992986  0.902458
('b', 'three')
key1   key2     data1     data2
3    b  three  0.458871 -1.895392
('b', 'two')
key1 key2     data1     data2
5    b  two -0.200124 -1.562237
```
```# GroupBy object conversion list
print(grouped1.mean())
list(grouped1)
```
```  key1     data1     data2
0    a  0.709792 -0.224477
1    b -0.244746 -0.851723

[('a',   key1   key2     data1     data2
0    a    one -0.147612 -0.348087
2    a    two  0.547541 -0.310040
4    a    two  1.224041  0.220150
6    a    one  1.539144 -0.758716
7    a  three  0.385845  0.074309), ('b',   key1   key2     data1     data2
1    b    one -0.992986  0.902458
3    b  three  0.458871 -1.895392
5    b    two -0.200124 -1.562237)]
```
```# GroupBy object conversion dict
dict(list(grouped1))
```
```{'a':   key1   key2     data1     data2
0    a    one -0.147612 -0.348087
2    a    two  0.547541 -0.310040
4    a    two  1.224041  0.220150
6    a    one  1.539144 -0.758716
7    a  three  0.385845  0.074309, 'b':   key1   key2     data1     data2
1    b    one -0.992986  0.902458
3    b  three  0.458871 -1.895392
5    b    two -0.200124 -1.562237}
```
```# Grouping by columns
print (df_obj.dtypes)

# Group by data type
df_obj.groupby(df_obj.dtypes, axis=1).size()
df_obj.groupby(df_obj.dtypes, axis=1).sum()
```
```key1      object
key2      object
data1    float64
data2    float64
dtype: object

---------------------------------------------------------------------------

KeyError                                  Traceback (most recent call last)

~\Anaconda3\lib\site-packages\pandas\core\indexes\base.py in get_loc(self, key, method, tolerance)
2896             try:
-> 2897                 return self._engine.get_loc(key)
2898             except KeyError:

pandas\_libs\index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas\_libs\index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas\_libs\hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

pandas\_libs\hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

KeyError: dtype('float64')

During handling of the above exception, another exception occurred:

KeyError                                  Traceback (most recent call last)

<ipython-input-15-f2dbc4ebe631> in <module>
4 # Group by data type
5 df_obj.groupby(df_obj.dtypes, axis=1).size()
----> 6 df_obj.groupby(df_obj.dtypes, axis=1).sum()

~\Anaconda3\lib\site-packages\pandas\core\groupby\groupby.py in f(self, **kwargs)
1380                 if isinstance(result, DataFrame):
1381                     for col in result.columns:
-> 1382                         result[col] = self._try_cast(result[col], self.obj[col])
1383                 else:
1384                     result = self._try_cast(result, self.obj)

~\Anaconda3\lib\site-packages\pandas\core\frame.py in __getitem__(self, key)
2978             if self.columns.nlevels > 1:
2979                 return self._getitem_multilevel(key)
-> 2980             indexer = self.columns.get_loc(key)
2981             if is_integer(indexer):
2982                 indexer = [indexer]

~\Anaconda3\lib\site-packages\pandas\core\indexes\base.py in get_loc(self, key, method, tolerance)
2897                 return self._engine.get_loc(key)
2898             except KeyError:
-> 2899                 return self._engine.get_loc(self._maybe_cast_indexer(key))
2900         indexer = self.get_indexer([key], method=method, tolerance=tolerance)
2901         if indexer.ndim > 1 or indexer.size > 1:

pandas\_libs\index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas\_libs\index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas\_libs\hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

pandas\_libs\hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

KeyError: dtype('float64')
```

## Other grouping methods

1. In fact, list is also a way of grouping
===When using lists, they are usually multi-level indexes
```df_obj2 = pd.DataFrame(np.random.randint(1, 10, (5,5)),
columns=['a', 'b', 'c', 'd', 'e'],
index=['A', 'B', 'C', 'D', 'E'])
df_obj2.ix[1, 1:4] = np.NaN
df_obj2
```
```C:\Users\wztli\Anaconda3\lib\site-packages\ipykernel_launcher.py:4: FutureWarning:
.loc for label based indexing or
.iloc for positional indexing

See the documentation here:
http://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#ix-indexer-is-deprecated
after removing the cwd from sys.path.
```
a b c d e
A 4 2.0 6.0 5.0 9
B 5 NaN NaN NaN 6
C 2 3.0 8.0 6.0 3
D 9 5.0 6.0 5.0 9
E 4 1.0 6.0 2.0 1
1. Group by dictionary
```# Group by dictionary
mapping_dict = {'A':'python', 'B':'python', 'C':'java', 'D':'C', 'E':'java'}
#df_obj2.groupby(mapping_dict, axis=1).size()
#df_obj2.groupby(mapping_dict, axis=1).count() # Number of non NaN
print(df_obj2.groupby(mapping_dict, axis=0).sum())
```
```        a    b     c    d   e
C       9  5.0   6.0  5.0   9
java    6  4.0  14.0  8.0   4
python  9  2.0   6.0  5.0  15
```
1. Group by function
```# Group by function
df_obj3 = pd.DataFrame(np.random.randint(1, 10, (5,5)),
columns=['a', 'b', 'c', 'd', 'e'],
index=['AA', 'BBB', 'CC', 'D', 'EE'])
#df_obj3

def group_key(idx):
"""
idx Column index or row index
"""
#return idx
return len(idx)

df_obj3.groupby(group_key).size()

# The above custom functions are equivalent to
#df_obj3.groupby(len).size()
```
```1    1
2    3
3    1
dtype: int64
```
1. Group by level index
```# Group by index level
columns = pd.MultiIndex.from_arrays([['Python', 'Java', 'Python', 'Java', 'Python'],
['A', 'A', 'B', 'C', 'B']], names=['language', 'index'])
df_obj4 = pd.DataFrame(np.random.randint(1, 10, (5, 5)), columns=columns)
df_obj4
```
language Python Java Python Java Python
index A A B C B
0 4 6 8 8 4
1 1 3 2 3 5
2 3 1 1 5 6
3 2 9 3 1 9
4 4 1 5 6 6
```# Group by language
df_obj4.groupby(level='language', axis=1).sum()
df_obj4.groupby(level='index', axis=1).sum()
```
index A B C
0 10 12 8
1 4 7 3
2 4 7 5
3 11 12 1
4 5 11 6

## polymerization

```dict_obj = {'key1' : ['a', 'b', 'a', 'b',
'a', 'b', 'a', 'a'],
'key2' : ['one', 'one', 'two', 'three',
'two', 'two', 'one', 'three'],
'data1': np.random.randint(1,10, 8),
'data2': np.random.randint(1,10, 8)}
df_obj5 = pd.DataFrame(dict_obj)
print (df_obj5)
```
```  key1   key2  data1  data2
0    a    one      9      4
1    b    one      6      7
2    a    two      9      4
3    b  three      9      6
4    a    two      6      2
5    b    two      3      3
6    a    one      1      1
7    a  three      2      6
```
1. Built in aggregate functions
```df_obj5
```
key1 key2 data1 data2
0 a one 9 4
1 b one 6 7
2 a two 9 4
3 b three 9 6
4 a two 6 2
5 b two 3 3
6 a one 1 1
7 a three 2 6
```# Built in aggregate functions
#print (df_obj5.groupby('key1').sum())
#print (df_obj5.groupby('key1').max())
#print (df_obj5.groupby('key1').min())
print (df_obj5.groupby('key1').mean())
#print (df_obj5.groupby('key1').size())
#print (df_obj5.groupby('key1').count())
#print (df_obj5.groupby('key1').describe())
'''
count: In group NA Value
std: standard deviation
var: variance
median: wrong NA Median in
mean: wrong NA Average value
'''
```
```      data1     data2
key1
a       5.4  3.400000
b       6.0  5.333333

'\ncount: In group NA Value\nstd: standard deviation\nvar: variance\nmedian: wrong NA Median in\nmean: wrong NA Average value\n25%||50%||75%What do you mean?==Not made?\n'
```
1. Custom aggregate function
```# Custom aggregate function
def peak_range(df):
"""
//Return value range
"""
#print type(df) #Parameter is the record corresponding to index
return df.max() - df.min()

print (df_obj5.groupby('key1').agg(peak_range))
#print df_obj.groupby('key1').agg(lambda df : df.max() - df.min())
#The default column name is the function name.
```
```      data1  data2
key1
a         8      5
b         6      4
```
1. Applying multiple aggregate functions at the same time: agg
```# Applying multiple aggregate functions at the same time: agg
print (df_obj.groupby('key1').agg(['mean', 'std', 'count']))

```
```         data1                     data2
mean       std count      mean       std count
key1
a     0.709792  0.674293     5 -0.224477  0.385674     5
b    -0.244746  0.726957     3 -0.851723  1.528271     3
```
```print (df_obj.groupby('key1').agg(['mean', 'std', 'count', ('range', peak_range)])) # Provide a new column name through a tuple
```
```         data1                               data2
mean       std count     range      mean       std count     range
key1
a     0.709792  0.674293     5  1.686756 -0.224477  0.385674     5  0.978865
b    -0.244746  0.726957     3  1.451857 -0.851723  1.528271     3  2.797850
```
```# Aggregate functions with different actions in each column
dict_mapping = {'data1':'mean',
'data2':'sum'}
print (df_obj.groupby('key1').agg(dict_mapping))
```
```         data1     data2
key1
a     0.709792 -1.122384
b    -0.244746 -2.555170
```
```dict_mapping = {'data1':['mean','max'],
'data2':'sum'}
print (df_obj.groupby('key1').agg(dict_mapping))
```
```         data1               data2
mean       max       sum
key1
a     0.709792  1.539144 -1.122384
b    -0.244746  0.458871 -2.555170
```

# Grouping operation

```import pandas as pd
import numpy as np
```

## Group and align

```s1 = pd.Series(range(10, 20), index = range(10))
s2 = pd.Series(range(20, 25), index = range(5))
print ('s1: ' )
print (s1)
print('===========================')
print ('s2: ')
print (s2)
```
```s1:
0    10
1    11
2    12
3    13
4    14
5    15
6    16
7    17
8    18
9    19
dtype: int64
===========================
s2:
0    20
1    21
2    22
3    23
4    24
dtype: int64
```
```# Series alignment
s1 + s2
print(s1+s2)
```
```0    30.0
1    32.0
2    34.0
3    36.0
4    38.0
5     NaN
6     NaN
7     NaN
8     NaN
9     NaN
dtype: float64
```
```df1 = pd.DataFrame(np.ones((2,2)), columns = ['a', 'b'])
df2 = pd.DataFrame(np.ones((3,3)), columns = ['a', 'b', 'c'])

print ('df1: ')
print (df1)
print ('=================')
print ('df2: ')
print (df2)
```
```df1:
a    b
0  1.0  1.0
1  1.0  1.0
=================
df2:
a    b    c
0  1.0  1.0  1.0
1  1.0  1.0  1.0
2  1.0  1.0  1.0
```
```# DataFrame alignment operation
print(df1 + df2)
```
```     a    b   c
0  2.0  2.0 NaN
1  2.0  2.0 NaN
2  NaN  NaN NaN
```

① Common operation function

```# Fill in unaligned data for operation
```
```0    30.0
1    32.0
2    34.0
3    36.0
4    38.0
5    14.0
6    15.0
7    16.0
8    17.0
9    18.0
dtype: float64
```
```df1.sub(df2, fill_value = 2.)
#sub function
```
a b c
0 0.0 0.0 1.0
1 0.0 0.0 1.0
2 1.0 1.0 1.0
```# Fill NaN
s3 = s1 + s2
print (s3)
```
```0    30.0
1    32.0
2    34.0
3    36.0
4    38.0
5     NaN
6     NaN
7     NaN
8     NaN
9     NaN
dtype: float64
```
```s3_filled = s3.fillna(-1)
print (s3)
```
```0    30.0
1    32.0
2    34.0
3    36.0
4    38.0
5     NaN
6     NaN
7     NaN
8     NaN
9     NaN
dtype: float64
```
```df3 = df1 + df2
print (df3)
```
```     a    b   c
0  2.0  2.0 NaN
1  2.0  2.0 NaN
2  NaN  NaN NaN
```
```df3.fillna(100, inplace = True)
print (df3)
```
```       a      b      c
0    2.0    2.0  100.0
1    2.0    2.0  100.0
2  100.0  100.0  100.0
```

## Statistical calculation yao differential aggregation aggregation must be grouped first.

```df_obj1 = pd.DataFrame(np.random.randn(5,4), columns = ['a', 'b', 'c', 'd'])
print(df_obj1)
```
```          a         b         c         d
0 -0.542708  0.201376  1.111431  1.784324
1  0.583422  0.231096 -2.801967  0.568497
2 -0.577329 -1.668581 -0.842126  1.803080
3 -0.128431 -1.769619  2.089983  0.209761
4  0.493981 -1.571405  0.690019 -0.215292
```
```print(df_obj1.sum(axis=1))
print('=====================================')
print(df_obj1.max())
print('=====================================')
print(df_obj1.min(axis=1))
```
```0    2.554423
1   -1.418952
2   -1.284956
3    0.401694
4   -0.602698
dtype: float64
=====================================
a    0.583422
b    0.231096
c    2.089983
d    1.803080
dtype: float64
=====================================
0   -0.542708
1   -2.801967
2   -1.668581
3   -1.769619
4   -1.571405
dtype: float64
```

## Data grouping operation

```# Keep shape after grouping operation
dict_obj = {'key1' : ['a', 'b', 'a', 'b',
'a', 'b', 'a', 'a'],
'key2' : ['one', 'one', 'two', 'three',
'two', 'two', 'one', 'three'],
'data1': np.random.randint(1, 10, 8),
'data2': np.random.randint(1, 10, 8)}
df_obj = pd.DataFrame(dict_obj)
df_obj
```
key1 key2 data1 data2
0 a one 4 3
1 b one 4 4
2 a two 9 6
3 b three 8 2
4 a two 3 3
5 b two 6 2
6 a one 4 1
7 a three 2 2
```# After grouping by key1, calculate the statistics of data1 and data2 = ====== and attach them to the original table
print(k1_sum)
print('================================')
print(df_obj)
```
```      sum_data1  sum_data2
key1
a            22         15
b            18          8
================================
key1   key2  data1  data2
0    a    one      4      3
1    b    one      4      4
2    a    two      9      6
3    b  three      8      2
4    a    two      3      3
5    b    two      6      2
6    a    one      4      1
7    a  three      2      2
```
1. merge method
```# Method 1, use merge
pd.merge(df_obj, k1_sum, left_on='key1', right_index=True)
```
key1 key2 data1 data2 sum_data1 sum_data2
0 a one 4 3 22 15
2 a two 9 6 22 15
4 a two 3 3 22 15
6 a one 4 1 22 15
7 a three 2 2 22 15
1 b one 4 4 18 8
3 b three 8 2 18 8
5 b two 6 2 18 8
1. transform method
```# Method 2, using transform
df_obj[k1_sum_tf.columns] = k1_sum_tf
df_obj
```
key1 key2 data1 data2 sum_key2 sum_data1 sum_data2
0 a one 4 3 onetwotwoonethree 22 15
1 b one 4 4 onethreetwo 18 8
2 a two 9 6 onetwotwoonethree 22 15
3 b three 8 2 onethreetwo 18 8
4 a two 3 3 onetwotwoonethree 22 15
5 b two 6 2 onethreetwo 18 8
6 a one 4 1 onetwotwoonethree 22 15
7 a three 2 2 onetwotwoonethree 22 15
1. Custom function
```#Custom function passed in transform
def diff_mean(s):
"""
Difference between return data and mean value
"""
return s - s.mean()

df_obj.groupby('key1').transform(diff_mean)
```
data1 data2 sum_data1 sum_data2
0 -0.4 0.000000 0 0
1 -2.0 1.333333 0 0
2 4.6 3.000000 0 0
3 2.0 -0.666667 0 0
4 -1.4 0.000000 0 0
5 0.0 -0.666667 0 0
6 -0.4 -2.000000 0 0
7 -2.4 -1.000000 0 0
```dataset_path = './data/starcraft.csv'
df_data = pd.read_csv(dataset_path, usecols=['LeagueIndex', 'Age', 'HoursPerWeek',
'TotalHours', 'APM'])
```
• apply
```def top_n(df, n=3, column='APM'):
"""
"""
return df.sort_values(by=column, ascending=False)[:n]

df_data.groupby('LeagueIndex').apply(top_n)
```
LeagueIndex Age HoursPerWeek TotalHours APM
LeagueIndex
1 2214 1 20.0 12.0 730.0 172.9530
2246 1 27.0 8.0 250.0 141.6282
1753 1 20.0 28.0 100.0 139.6362
2 3062 2 20.0 6.0 100.0 179.6250
3229 2 16.0 24.0 110.0 156.7380
1520 2 29.0 6.0 250.0 151.6470
3 1557 3 22.0 6.0 200.0 226.6554
484 3 19.0 42.0 450.0 220.0692
2883 3 16.0 8.0 800.0 208.9500
4 2688 4 26.0 24.0 990.0 249.0210
1759 4 16.0 6.0 75.0 229.9122
2637 4 23.0 24.0 650.0 227.2272
5 3277 5 18.0 16.0 950.0 372.6426
93 5 17.0 36.0 720.0 335.4990
202 5 37.0 14.0 800.0 327.7218
6 734 6 16.0 28.0 730.0 389.8314
2746 6 16.0 28.0 4000.0 350.4114
1810 6 21.0 14.0 730.0 323.2506
7 3127 7 23.0 42.0 2000.0 298.7952
104 7 21.0 24.0 1000.0 286.4538
1654 7 18.0 98.0 700.0 236.0316
8 3393 8 NaN NaN NaN 375.8664
3373 8 NaN NaN NaN 364.8504
3372 8 NaN NaN NaN 355.3518
```# The parameters received by the apply function will be passed into the custom function
df_data.groupby('LeagueIndex').apply(top_n, n=2, column='Age')
```
LeagueIndex Age HoursPerWeek TotalHours APM
LeagueIndex
1 3146 1 40.0 12.0 150.0 38.5590
3040 1 39.0 10.0 500.0 29.8764
2 920 2 43.0 10.0 730.0 86.0586
2437 2 41.0 4.0 200.0 54.2166
3 1258 3 41.0 14.0 800.0 77.6472
2972 3 40.0 10.0 500.0 60.5970
4 1696 4 44.0 6.0 500.0 89.5266
1729 4 39.0 8.0 500.0 86.7246
5 202 5 37.0 14.0 800.0 327.7218
2745 5 37.0 18.0 1000.0 123.4098
6 3069 6 31.0 8.0 800.0 133.1790
2706 6 31.0 8.0 700.0 66.9918
7 2813 7 26.0 36.0 1300.0 188.5512
1992 7 26.0 24.0 1000.0 219.6690
8 3340 8 NaN NaN NaN 189.7404
3341 8 NaN NaN NaN 287.8128
• Group not allowed
```df_data.groupby('LeagueIndex', group_keys=False).apply(top_n)
```
LeagueIndex Age HoursPerWeek TotalHours APM
2214 1 20.0 12.0 730.0 172.9530
2246 1 27.0 8.0 250.0 141.6282
1753 1 20.0 28.0 100.0 139.6362
3062 2 20.0 6.0 100.0 179.6250
3229 2 16.0 24.0 110.0 156.7380
1520 2 29.0 6.0 250.0 151.6470
1557 3 22.0 6.0 200.0 226.6554
484 3 19.0 42.0 450.0 220.0692
2883 3 16.0 8.0 800.0 208.9500
2688 4 26.0 24.0 990.0 249.0210
1759 4 16.0 6.0 75.0 229.9122
2637 4 23.0 24.0 650.0 227.2272
3277 5 18.0 16.0 950.0 372.6426
93 5 17.0 36.0 720.0 335.4990
202 5 37.0 14.0 800.0 327.7218
734 6 16.0 28.0 730.0 389.8314
2746 6 16.0 28.0 4000.0 350.4114
1810 6 21.0 14.0 730.0 323.2506
3127 7 23.0 42.0 2000.0 298.7952
104 7 21.0 24.0 1000.0 286.4538
1654 7 18.0 98.0 700.0 236.0316
3393 8 NaN NaN NaN 375.8664
3373 8 NaN NaN NaN 364.8504
3372 8 NaN NaN NaN 355.3518
Published 16 original articles, won praise 1, visited 43

Keywords: Python Java IPython Lambda

Added by JCF22Lyoko on Fri, 13 Mar 2020 14:49:33 +0200