Today, I know several data type operations
This is my first contact ,java There is no prototype in it, haha
It means for and while The operation that normally ends after the cycle
str = 'python It's fun '
for i in str:
print(i)
else:
print(' This is executed when the loop ends ')
I got it! Python Of '''''' Three quotes
I also know escape characters
# character string
a ='hello'
b = "python"
c = '''world'''
print(type(a))
print(type(b))
print(type(c))
# / escape
qq ='I\'math'
print(qq)Slice new words
# Get the subscript of the specified string Subscript from 0 Start
qqq = 'asdfghjkl'
print(qqq[1])
# section
print(qqq[0:3:1])qqq = 'asdfghjkl'
# Find the subscript of the string you want in a string
print(qqq.find('a')) 
# mystr Replace
strs = '1212121212'
print(strs.replace('1','3'))
capitalize Only the first letter of the string can be changed
# toggle case Capitalize the first letter
strZhuan = 'qw eqwe qwe'
print(strZhuan.capitalize())
strZhuan Change the capitalization of each initial
strZhuan = 'qw eqwe qwe'
print(strZhuan.strZhuan ())
Switch all case
lower Each one is lowercase upper Each one is capitalized
strZhua = 'ADADADAD'
print(strZhua.lower())
# Convert small and medium case strings to uppercase
strZh = 'ADADADAD'
print(strZh.upper())
Remove white space , String to its
# Delete the blank space to the left of the string
mystr = ' Left side measurement 2 '
print(mystr.lstrip())
# Delete the blank space to the right of the string
mystr2 = ' edge '
print(mystr.rstrip())
# Delete the space to the left of the string
mystr3 = ' Left edge '
print(mystr.strip())\
# Fill character
q = 'hello'
print(q.ljust(10,'1')) 
Fill in the following to judge whether the strings are the same
# Judge whether the beginning is
print(q.startswith('h',0,1))
# Judge whether it is all letters
a = ' good 121'
print(a.isalpha())
# Judge whether it contains only numbers
print(a.isdigit())
# Judging a string Are there any letters and Numbers
print(a.isalnum())
# Judge whether it's a space
kong = ' '
print(kong.isspace())
Splicing is a list All of them are spliced in a format you specify
# Merge and splice a character or original string
list1 = ['1','2','3','4','5','6']
new_Str = '...'.join(list1)
print(new_Str) 
Segmentation is to divide the characters you specify according to the characters you specify The first one running above
# toggle case Capitalize the first letter
strZhuan = 'qw eqwe qwe'
# Division Divide and return according to the characters you enter list
list = strZhuan.split("q")
print(list)there list Operation and java equally
index Query subscript
# list
name_list = ['lanlan','zhangyue','wangba']
print(name_list[0])
print(name_list[1])
print(name_list[2])
# Check the subscript of the data you want
print(name_list.index('zhangyue',0,2))
# Record the data you specified in lis There are several times in it. If there is no error, report it
print(name_list.count('lanlan'))
# list Total length
print(len(name_list))
# Judge whether the data is list Inside
print('lanlan'in name_list)
print('lanlan'not in name_list)
Delete list, Loop traversal list
# Case query whether the name entered by the user is in the set
name_listto = [' Zhang San ',' Li Si ',' Wang Wu ']
# Add data
name_listto.append('zhanghong')
# Add data Disassemble and add according to the subscript
name_listto.extend('123')
# Specify the subscript position to add data
name_listto.insert(0,'suijie')
# Remove elements
del_name = name_listto.pop(1)
del del_name
# Delete specified data
name_listto.remove(' Li Si ')
# Delete all
name_listto.clear()
print(name_listto)
name = input(' Please enter the name you want to search ')
if name in name_listto:
print(f'{name}, stay ')
else:
print(f'{name}, be not in ')
# modify
lsits = [1,2,3,4,5]
# Specify modification
lsits[0] = 10
print(lsits)
# Inverse data
lsits.reverse()
print(lsits)
# Sort true Descending
lsits.sort(key=None,reverse=False)
print(lsits)
# Copy list
copys = lsits.copy()
print(copys)
# Loop through the list
i = 0
while i <len(copys):
print(copys[i])
i+=1
for i in copys:
print(i)
# List nesting
qiantao_list = [['1,2,3,4'],['sui','asda']]
# Take the data
print(qiantao_list[1][1])Tuple data cannot be deleted
# Define tuple pairs
dingyi = (9,1,3,1,1,1,1)
# A single tuple must be added , Otherwise it would be int type
dingyi2 = (9,)
# Tuple query Subscript
print(dingyi.index(3))
# Number of queries
print(dingyi.count(1))
# Total number of tuples
print(len(dingyi))
# Tuple data modification
update_list = ("asd","asd",[1,2])
update_list[2][1] = 'asdad'
print(update_list[2][1])
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