1. String (str)
1>#Function: For capitalization, does not change itself, and generates a new value
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: used for capitalization, does not change itself, will generate a new value user_name = 'tianjianyu' new_user_name = user_name.capitalize() print(new_user_name)
2>#Function: Change all capitals to lowercase, casefold s can also be used in other languages, such as German
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: Change all capitals to lowercase, casefold can also be used in other languages, such as German user_name = 'TianJianYu' new_user_name = user_name.casefold() print(new_user_name)
3>#Function: for converting all capitals to lowercase
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: Used to lower case all capitals, similar to casefold, but not in other languages user_name = 'TianJianYu' new_user_name = user_name.lower() print(new_user_name
4>#Function: for text centering
#-*- coding:utf-8 -*- #Function: for text centering #Parameter 1: Represents the total length #Parameter 2: Characters representing padding in white space (only unique) user_name = 'tianjianyu' new_user_name = user_name.center(20) print(new_user_name) user_name = 'tianjianyu' new_user_name = user_name.center(20,'*') print(new_user_name)
5>#Function: Used to count the number of occurrences of incoming characters
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: Used to count the number of occurrences of incoming characters #Parameter 1: Value to find #Parameter 2: Start position (index) #Parameter 3: End (Index) user_name = 'tianjianyu' new_user_name = user_name.count('n',0,4) print(new_user_name)
6>#Function: Used to determine if the end of a character has been passed in: (If yes, return to True, otherwise: Fasle)
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: Used to determine if the end of a character has been passed in: (If yes, return to True and vice versa: Fasle) #Parameter 1: Incoming characters user_name = 'tianjianyu' new_user_name = user_name.endswith('yu') print(new_user_name)
7>#Function: Used to determine if an incoming character begins: (If yes, return to True, otherwise: Fasle)
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: Used to determine if the incoming character begins: (If yes, return to True and vice versa: Fasle) #Parameter 1: Incoming characters user_name = 'tianjianyu' new_user_name = user_name.startswith('tian') print(new_user_name)
8>#Function: used to find the tab t, along with the characters in front of it
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: used to find the tab \t, along with the characters in front of it #Parameter 1: Total length with leading characters user_name = 'tian\tjian\tyu' new_user_name = user_name.expandtabs(20) print(new_user_name)
9>#Function: Index position used to find subsequences, returns -1 if none exists
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: To find the index position of a subsequence, return -1 if it does not exist #Parameter 1: Characters used for lookup user_name = 'tianjianyu' new_user_name = user_name.find('j') print(new_user_name)
10>#Function: for string formatting
#!/usr/bin/env python #-*- coding:utf-8 -*- # Function: for string formatting # 1. Use of placeholders: user_info = 'user:%s,age:%s,gender:%s' new_user_info = user_info%('tianjianyu',23,'male') print(new_user_info) #2. How to use format: user_info = 'user:{0},age:{1},gender:{2}' new_user_info = user_info.format('tianjianyu',23,'male') print(new_user_info) #How format_map is used: user_info = 'I am:{name},Age:{age},Gender:{gender}' new_user_info = user_info.format_map({'name':'tianjianyu','age':23,'gender':'male'}) print(new_user_info)
11>#Function: Determine whether it is a number, letter, or Chinese character (if yes, the return value is True, otherwise Fasle)
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: Determine whether it is a number, letter, or Chinese character (if yes, the return value is True, otherwise Fasle) num_name = 'tianjianyu12 male' new_num_name = num_name.isalnum() print(new_num_name)
12>#Function: Determine if it is a number
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: Determine if it is a number num = '123' v1 = num.isdecimal() #123(*) v2 = num.isdigit() #123，② v3= num.isnumeric() #123, 2, 2 print(v1,v2,v3)
13>#Function: Determine if you can act as a variable
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: Determine if you can act as a variable n = 'name' v = n.isidentifier() print(v)
14>#Function: Determine if all characters are case or not
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: Determine if all characters are case-sensitive user_name = 'TIANJIANYU' new_lower_name = user_name.islower() #Determine if all are lowercase (return value is Fasle) print(new_lower_name) new_upper_name = user_name.isupper() #Determine if all are capitalized (return value is True) print(new_upper_name)
15>#Function: capitalize all letters
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: capitalize all letters name = 'tianjianyu' new_name = name.upper() print(new_name)
16>#Function: Determines whether characters that cannot be printed, such as escape characters, will return Fasle
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: Determines whether characters that cannot be printed, such as escape characters, will return Fasle user_name = 'tian\njian\nyu' v = user_name.isprintable() print(v)
17>#Function: Determine if all spaces are, if yes, return to True, otherwise Fasle
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: Judges whether all spaces are spaces, returns True if yes, and vice versa Fasle name =' ' v = name.isspace() print(v)
18>#Function: for string stitching
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: for string stitching name ='tianjianyu' new_name = '_'.join(name) #No element in inner loop followed by'' print(new_name) user_list = ['tian','jian','yu'] new_user_list = '*'.join(user_list) print(new_user_list)
19>#Function: for left and right filling
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: for left and right filling name ='tian' v1 = name.rjust(20,'*') #padding-left print(v1) v2 = name.ljust(20,'*') #Right Fill print(v2)
20>#Function: Correspondence and translation for customization
#!/usr/bin/env python #-*- coding:utf-8 -*- #Functions: Used for custom correspondence and Translation m = str.maketrans('tian','1234') #Custom Relationships name = 'tianjianyu' v = name.translate(m) #Bring custom relationships into strings print(v)
21>#Function: Split, and keep the split elements
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: divide, and keep the split elements user_name = 'tian_jianyu' new_user_name = user_name.partition('_') print(new_user_name)
22>#Function: for replacement
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: for replacement #Parameter 1: Characters to be replaced #Parameter 2: Why replace characters #Parameter 3: Several characters need to be replaced user_name = 'tian|jian|yu' new_user_name = user_name.replace('|','',2) print(new_user_name)
23>#Function: for removing blanks or for customizing
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: used to remove blanks, or can be customized name = 'tianjianyu ' new_name = name.strip() print(new_name)
24>#Function: for case replacement of characters
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: for case replacement of characters name = 'tianJIANYU' new_name =name.swapcase() print(new_name)
25>#Function: for fill, fill 0
#!/usr/bin/env python #-*- coding:utf-8 -*- #Function: for fill, fill 0 name ='tian' new_name = name.zfill() print(new_name)
26>
#!/usr/bin/env python #-*- coding:utf-8 -*- name1 = 'tian' name2 = 'jian' name3 = 'yu' name = name1+name2+name3 #Function to perform u add_u print(name)