print('hello world!')
#Print the contents in''

Four variables

name = 'Sticky_Fingers'
# Name is the variable name and''is the variable value, which means assigning the value in'' to the variable.
gold  English letter beginning
_ experience  Underline the beginning
4 The Dream # Error

Three characteristics of defining variables:

id        #Address used to represent the value of a variable in memory
type      #Types of variable values
value     #Values of variables

PLATINUM = 'Platinum'

standname = input('Your stand-in name:')
print(standname)

str1 = 'Honorable users, hello! Your telephone bill for this month is deducted%s Yuan, left%d Yuan.' %('Nonacosa',44)
print(str1)
#44 Can't add''，%d Instead of numbers, add numbers.''It will then represent a string.

#int
geniusboy = int(16)
print(geniusboy)
print(type(geniusboy))

#float
height = float(1.75)
print(height)
print(type(height))

stand = 'Gold Experience'

Priority operation:

1. Value by index (forward + reverse): only

#1.Value by index(Forward+Reverse fetching)
#Forward
print(stand[0]) #G
print(stand[5]) #E
#reverse
print(stand[-1]) #e

2. Section (head and tail, step length)

#2.Section
print(stand[0:6]) #Gold Ex
#step
print(stand[0:14:2]) #Gl xeine

3. Length len

#3.length
print(len(stand)) #14

4. Membership operations in and not in

#4.Membership operation in and not in
print('Gold' in stand)       #True
print('Gold' not in stand)   #False

5. Remove the blank strip

#5.Remove blanks
#Removes spaces on the left and right sides of the string
stand = '     Gold  '
print(stand)
print(stand.strip())  #Gold
#Remove the specified string
stand1 = '?Gold!'
print(stand1.strip('!').strip('?'))

6. Segmentation split

#6.segmentation
#According to the space in the variable value, the obtained part is stored in it.[]List
print(stand.split(' '))  #['Gold','Experience']

7. Cycle

#7.loop
#Traverse the string and print each character
for line in stand:
    print(line)

Need to master:

stand ='    Gold  '
#1.strip，lstrip，rstrip
print(stand)
print(stand.strip())  #Remove both sides of the blank
print(stand.lstrip()) #Remove the left space
print(stand.rstrip()) #Remove the right space

2,lower,upper

#2.lower，upper
#Convert to lowercase
print(stand.lower()) #gold
#uppercase
print(stand.upper()) #GOLD

3,startswith,endswith

#3.startswith,endswith
print(stand.startswith(' ')) #True
print(stand.endswith('d'))   #False

4. Three Plays of Form

#4.format Three uses of formatted output
str1 = 'Gioruno·Jobana has%s A dream is to be%s' %(1,'gang star')
#Mode 1: Format according to position order
print('Gioruno·Jobana has{}A dream is to be{}'.format(1,'gang star'))
#Mode 2: Format according to index
print('Gioruno·Jobana has{0}A dream is to be{1}'.format(1,'gang star'))
#Mode 3: Name Formatting
print('Gioruno·Jobana has{number}A dream is to be{who}'.format(number=1,who='gang star'))

5,split,rsplit

6,join

#6.join StringBuilder
#String splicing is allowed only
print(' '.join(['Gold','Experience','\b—Giorno Giovanna']))

7,replace

#7.String substitution
str1 = 'AriAriAriAri...Arrivederci!'
print(str1)
str2 = str1.replace('Ari','Ora').replace('Arrivederci','Ora')
print(str2)

8,isdigit

#8.Determine whether a string is a number
choice = input('Did you drop the gold sword or the silver sword? One.Golden Sword 2.Silver Sword 3.I am an honest man.')
print(choice.isdigit())