F-String是Python拥有的一个很强的特色功能。其目的是为了简化格式化字符串的方式，在2015年由Eric Smith在PEP 498— Literal String Interpolation中提出来的。本文收集设计了经典的fstring的使用例子，强烈推荐收藏，对读者后续编写程序，优美的使用f-string，可以做为很好的参考。在没有fstring时候，格式化字符串可以用...
下一节中,我会用一些例子向你展示一些你用f-string能做或不能做的事儿。 3、f-string 的限制 虽然f-string十分的便捷,但它并不能完全代替str.format。f-string在表达式出现的上下文中进行求值计算。根据PEP498,这意味着该表达式可以获取所有局部和全局变量。而且该表达式是在运行时计算的表达式。如果在 { <expr...
f-string examples: importdatetime name='Fred' age=50 anniversary=datetime.date(1991,10,12) # example1: f'My name is{name}, my age next year is{age+1}, my anniversary is{anniversary:%A,%B%d,%Y}.' >>>'My name is Fred, my age next year is 51, my anniversary is Saturday, Octob...
An f-string is denoted by thefprefix and allows embedded expressions inside curly brackets{}. These expressions are evaluated at runtime, making f-strings a great choice for constructing dynamic strings. For example: name = "Alice" age = 30 print(f"Hello, my name is {name} and I am {...
Python string formatting The following example summarizes string formatting optionsinPython.#!/usr/bin/pythonname='Peter'age= 23print('%s is %d years old'%(name, age))print('{} is {} years old'.format(name, age))print(f'{name} is {age} years old')>>>print('%s is %d years old'...
--- --- --- 参考: https://stackoverflow.com/questions/8234445/format-output-string-right-alignment https://github.com/astanin/python-tabulate https://www.geeksforgeeks.org/string-alignment-in-python-f-string/
For example, you may have a hundred debugging messages but only ten warning messages in your code. If you use an f-string or the .format() method to construct your logging messages, then Python will interpolate all the strings regardless of the logging level that you’ve chosen. However, ...
with open("example.txt", "r") as file:content = file.read()# 在文件中查找子字符串position = content.find("Hello")# 输出结果if position != -1:(tab)print(f"'Hello' found at position {position}")else:(tab)print("'Hello' not found")本例中 首先，我们打开一个名为"example.txt"的...
在 Python 3.6 之后，引入了 f-string 字符串格式化方法，可以直接在字符串前加上前缀f，然后在字符...
Example f-strings Let's start with these variables: >>>full_name="Trey Hunner">>>costs=[1.10,0.30,0.40,2] This f-string hasone replacement field: >>>print(f"My name is{full_name}.")My name is Trey Hunner. This f-string hastwo replacement fields: ...