:.2%即为设置保留 2 位小数并在字符串末尾添加一个百分号,且会自动根据保留小数位进行四舍五入。 f-string调试模式{variable = } 你仔细观察下上面的例子,是不是发现语法书写变化了,这种写法就是f-string调试模式。 f-string 的调试功能是另一种书写语法,即使用{variable = }代替variable = {},如下面代码所示。
Python输出格式化 格式化字符串语法 1.format 1.1 Format String Syntax 格式字符串语法 str.format() 方法和 Formatter 类共享相同的格式字符串语法(尽管在 Formatter 的情况下,子类可以定义自己的格式字符串语法)。 语法与格式化字符
>>> f"num rounded to 2 decimalpalces = {num:.2f}" 'num rounded to 2 decimal palces = 4.12’ 1. 2. 3. 不加任何选项的话,则会打印浮点数本身的精确值。 >>> print(f'{num}') 4.123956 1. 2. 3. 9、如何将一个数字格式化为百分数 Python f-string方法有个非常便捷的实现格式化百分数的操作...
(1) s: string, 字符串; (2) d: decimal integer, 十进制数; (3) i: integer, 用法同%d; (4) u: unsigned integer, 无符号十进制数; (5) f: float, 浮点数(默认保留小数点后6位); (6) F: Float, 浮点数(默认保留小数点后6位); (7) e: exponent, 将数字表示为科学计数法(小写e, 默认...
Here, the format specifier is stored in a variable and then used inside the f-string. This technique is useful for creating flexible and reusable formatting code. $ python main.py 16.03.24 24/03/16 Formatting floats F-strings make it easy to control the number of decimal places when displa...
Python's f-strings provide a readable way to interpolate and format strings. They're readable, concise, and less prone to error than traditional string interpolation and formatting tools, such as the .format() method and the modulo operator (%). F-string
12.30000The output shows the number having twoandfive decimal places. Python f-string format width The width specifier sets the width of the value. The value may be filled with spacesorother charactersifthe valueisshorter than the specified width. ...
Notice how we can perform calculations directly within the string formatting: # Basic arithmetic operations x = 10 y = 5 print(f"Addition: {x + y}") print(f"Multiplication: {x * y}") print(f"Division with 2 decimal places: {x / y:.2f}") Powered By Output Addition: 15 ...
Formatting numbers It'sverycommon to see format specifications used with numbers in Python. Below are the most useful string format specifications for numbers. You cantest some of these out from your browser here. N digits after the decimal point (fixed-point notation) ...
assert id("some_string") == id("some" + "_" + "string") assert id("some_string") == id("some_string")2. True because it is invoked in script. Might be False in python shell or ipythona = "wtf" b = "wtf" assert a is b a = "wtf!" b = "wtf!" assert a is b ...