标准格式说明符的一般形式如下: format_spec ::= [[fill]align][sign]["z"]["#"]["0"][width][grouping_option]["."precision][type] fill ::= <anycharacter> align ::="<"|">"|"="|"^"sign ::="+"|"-"|" "width ::= digit+ grouping_option ::="_"|","precision ::= digit+ty...
S.ljust(width[, fillchar]) -> string Return S left-justified in a string of length width. Padding is done using the specified fill character (default is a space). """ return "" def lower(self): """ 变小写 """ """ S.lower() -> string Return a copy of the string S converted...
test="Python Programming"print("String: ",test)# First one character first_character=test[:1]print("First Character: ",first_character)# Last one character last_character=test[-1:]print("Last Character: ",last_character)# Everything except the first one character except_first=test[1:]print...
element_index ::= digit+ | index_string index_string ::= <any source character except "]"> + conversion ::= "r" | "s" | "a" format_spec ::= <described in the next section> 1. 2. 3. 4. 5. 6. 7. 8. 在不太正式的术语中,替换字段 可以以field_name开头,该字段指定要将其值...
目录只有包含一个叫做 __init__.py 的文件才会被认作是一个包,主要是为了避免一些滥俗的名字(比如叫做 string)不小心的影响搜索路径中的有效模块。 最简单的情况,放一个空的 :file:__init__.py就可以了。当然这个文件中也可以包含一些初始化代码或者为(将在后面介绍的) __all__变量赋值。
Format String Syntax Format strings contain “replacement fields” surrounded by curly braces {}. Anything that is not contained in braces is considered literal text, which is copied unchanged to the output. If you need to include a brace character in the literal text, it can be escaped by ...
1. replace法 利用replace函数，对于字符串中的三个字符进行多次替换，不需要导入其它的包，可以一次替换...
string.rjust/ljust(length, character) length: 要返回的字符串的长度[必需的] character: 字符用于填充空缺的空间,默认为空格[可选] 例子 9. strip( ) strip()方法会返回一个去掉前导和结尾字符的字符串的副本。要删除的默认字符是空格。 语法 string.strip(character) ...
The f-string debug option Python 3.8 introduced the self-documenting expression with the=character. main.py #!/usr/bin/python import math x = 0.8 print(f'{math.cos(x) = }') print(f'{math.sin(x) = }') The example outputs the Sine and Cosine functions in the debug mode. ...
Return a capitalized version of the string. More specifically, make the first character have upper case and the rest lower case. """passdefcasefold(self, *args, **kwargs):# real signature unknown""" Return a version of the string suitable for caseless comparisons. """passdefcenter(self,...