Summary of string operation methods in python (code example)

This article brings you a summary of string operation methods in python (code examples). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

String (string):

Definition and creation of strings:

Definition: A string is an ordered collection of characters used to store and represent basic text message.
Note: Neither single quotes nor double quotes in strings can cancel the meaning of special characters. If you want

var1='Hello World!'
print (var1)

within the quotes, the corresponding operation:

1, "*" repeats the output characters String

print('Hello World'*2)

2,"[]","[:]" Obtain the characters in the string through index, which is the same as the slicing operation of the list

print('Hello World'[2: ])

3. "in" member operator returns True if the string contains the given character

print('el' in 'Hello World')

4,"%"Format string

print('alex is a good teacher')
print('%s is a good teacher' %'alex')

5," " String splicing

a ='123'
b='abc'
c=a+b
print(c)

Note: " " is inefficient, use join

c=''.join([a,b])
print(c)

Common methods for strings:

Replacement and deletion of strings , intercept, copy, connect, compare, search, split

#capitalize: the first letter is capitalized, the other letters are lowercase

s='asf sgs SD dfs ASdf'
print(s.capitalize())
>>Asf sgs sd dfs asdf

#lower()               Convert to lowercase
#upper () Convert to uppercase
#swapase() Swap case

a='hello word'
print(a.upper())
b='HELLO WORD'
print(b.lower())
c='hello WORD'
print(c.swapcase())
>>HELLO WORD
>>hello word
>>HELLO word

#s.strip(): Delete the specified characters on both sides of the string, the default is empty

s='     hello    '
b=s.strip()
print(b)
>>hello

#s.lstrip(): Delete the specified characters on the left side of the string,
#s.rstrip(): Delete the specified characters on the left side of the string,

s='     hello    '
b=s.ltrip()
c=s.rtrip()
print(b)
print(c)
>>hello
>>    hello

#Copy String

a='hello'
b=a*2
print(b)
>>hellohello

#Connect two strings str.join

a='hello'
b='123'
a.join(b)
print(a.join(b))
>>1hello2hello3

#Find the string str.index;str.find has the same function.
The difference is that the index cannot be found and an error is reported. find returns '-1' if it cannot be found. If both are found, it returns the position of the first one found

a='hello word'
print(a.index('w'))
print(a.find('a'))
>>6
>>-1

# Determine whether the specified string 'in' or 'not in' is included.

a='hello word'
print('hello' in a)
print('hello' not in a)
>>True
>>False

#View the length of the string len

a='hello word'
print(len (a))
>>10

#srt.centen Put the string in the center position to specify the length and characters on both sides of the position

a='chen zheng'
print(a.center(20,"*"))
>>*****chen zheng*****

#str.count()  统计字符串出现的次数
a='hello word'
print(a.count('l'))
>>2

#
S='prefix123aaasuffix'
print(S.startswith('prefix'))  #是否以prefix开头
print(S.endswith('suffix'))    #以suffix结尾
print(S.isalnum())             #是否全是字母和数字，并至少有一个字符
print(S.isalpha())             #是否全是字母，并至少有一个字符
print(S.isdigit())             #是否全是数字，并至少有一个字符
print(S.isspace())             #是否全是空白字符，并至少有一个字符
print(S.islower())             #S中的字母是否全是小写
print(S.isupper())             #S中的字母是否便是大写
print(S.istitle())             #S是否是首字母大写的

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