Python字符串方法
Python字符串是用引号括起来的 Unicode字符序列。在本文中，我们将讨论内置函数，即Python提供的对字符串进行操作的函数。
注意：每个字符串方法都不会更改原始字符串，而是返回具有更改属性的新字符串。
字符串的大小写更改
以下函数用于更改字符串。
- lower()：将字符串的所有大写字符转换为小写
- upper()：将字符串的所有小写字符转换为大写
- title()：将字符串转换为标题大小写
示例：更改Python字符串的大小写。
Python3
# Python3 program to show the
# working of upper() function
text = 'geeKs For geEkS'
# upper() function to convert
# string to upper_case
print("\nConverted String:")
print(text.upper())
# lower() function to convert
# string to upper_case
print("\nConverted String:")
print(text.lower())
# rpartition breaks the string
print("\nConverted String:")
print(text.title())
# original string never changes
print("\nOriginal String")
print(text)输出
Converted String:
GEEKS FOR GEEKS
Converted String:
geeks for geeks
Converted String:
Geeks For Geeks
Original String
geeKs For geEkSPython字符串方法表
| Function Name | Description |
|---|---|
| capitalize() | Converts the first character of the string to a capital (uppercase) letter |
| casefold() | Implements caseless string matching |
| center() | Pad the string with the specified character. |
| count() | Returns the number of occurrences of a substring in the string. |
| encode() | Encodes strings with the specified encoded scheme |
| endswith() | Returns “True” if a string ends with the given suffix |
| expandtabs() | Specifies the amount of space to be substituted with the “\t” symbol in the string |
| find() | Returns the lowest index of the substring if it is found |
| format() | Formats the string for printing it to console |
| format_map() | Formats specified values in a string using a dictionary |
| index() | Returns the position of the first occurrence of a substring in a string |
| isalnum() | Checks whether all the characters in a given string is alphanumeric or not |
| isalpha() | Returns “True” if all characters in the string are alphabets |
| isdecimal() | Returns true if all characters in a string are decimal |
| isdigit() | Returns “True” if all characters in the string are digits |
| isidentifier() | Check whether a string is a valid identifier or not |
| islower() | Checks if all characters in the string are lowercase |
| isnumeric() | Returns “True” if all characters in the string are numeric characters |
| isprintable() | Returns “True” if all characters in the string are printable or the string is empty |
| isspace() | Returns “True” if all characters in the string are whitespace characters |
| istitle() | Returns “True” if the string is a title cased string |
| isupper() | Checks if all characters in the string are uppercase |
| join() | Returns a concatenated String |
| ljust() | Left aligns the string according to the width specified |
| lower() | Converts all uppercase characters in a string into lowercase |
| lstrip() | Returns the string with leading characters removed |
| maketrans() | Returns a translation table |
| partition() | Splits the string at the first occurrence of the separator |
| replace() | Replaces all occurrences of a substring with another substring |
| rfind() | Returns the highest index of the substring |
| rindex() | Returns the highest index of the substring inside the string |
| rjust() | Right aligns the string according to the width specified |
| rpartition() | Split the given string into three parts |
| rsplit() | Split the string from the right by the specified separator |
| rstrip() | Removes trailing characters |
| splitlines() | Split the lines at line boundaries |
| startswith() | Returns “True” if a string starts with the given prefix |
| strip() | Returns the string with both leading and trailing characters |
| swapcase() | Converts all uppercase characters to lowercase and vice versa |
| title() | Convert string to title case |
| translate() | Modify string according to given translation mappings |
| upper() | Converts all lowercase characters in a string into uppercase |
| zfill() | Returns a copy of the string with ‘0’ characters padded to the left side of the string |
注意：有关Python字符串的更多信息，请参阅Python字符串教程。