print(f"整型为{data},浮点型为{data2},字符串为{data3}") #格式f/F"{variable_name},{variable_name},{variable_name}" print(f"整型为{data:4},浮点型为{data2:4},字符串为{data3:4}") #f/F{variable_name:宽度} print(f"整型为{data:<4}, 浮点型为{data2:<4}, 字符串为{data3:<4...
在尝试打印 undefined_variable 的值时,由于该变量从未被定义,Python 解释器会引发 NameError 异常。...这个异常被 try-except 块捕获,并打印出错误消息。 SyntaxError 在 Python 中,SyntaxError 异常是一个内置异常类型,用于指示代码中存在语法错误。...案例 # 这是一个包含语法错误的Python代码示例 # 定义一个函数...
Variable Names We can use differentvariable namesin python programming. This can be one letter like a, b, x etc., one more letter or a combination of letters, digits and underscore character (_). Avariable namecan start with a lower case, upper case or underscore character. But a python...
print my_variable ```- 打印多个变量：```python a = 5 b = 10 print "a:", a, "b:", ...
echo print() printf() print_r() echo 可以一次输出多个值，多个值之间用逗号分隔。echo是语言...
print(输出的对象,sep=''设定的分隔符如果不设置默认为空格分割,end=''设定输出以什么结尾默认为换行,file=表示数据输出的文件对象),如下所示: # -*- encoding: utf-8 -*- """ File variable1.py Created on 2022/9/30 9:33 Copyright (c) 2022/9/30 ...
例如,如果我们整个程序总共就不到10行代码,那么,我们用i来给一个变量命名是完全OK的。而且,此时通常就用一个单词做一个变量名。如果在这么短的程序中,每个变量都像this_is_a_variable_name一样,这么长,反而会显得很不协调、很奇怪。 如果我们的程序存在比较复杂的嵌套关系,而且一个变量在总共大几百行代码中的...
inner_function()# print the value of the global variableprint(global_var)# call the outer function and print local and nested local variablesouter_function() Run Code Output 10 20 30 In the above example, there are three separate namespaces: the global namespace, the local namespace within ...
Python Variable Name Rules Must begin with a letter (a-z, A-Z) or an underscore (_). Subsequent characters can be letters, numbers, or underscores. Case-sensitive:age, Age, and AGE are considered different variables. Can be of any reasonable length. ...
Python中的$variable name获取os.getenv 您可以使用$作为变量名,请尝试以下代码: import os key = 'HOME'value = os.getenv(key)print("Value of 'HOME' environment variable :", value) key = '$'value = os.getenv(key)print("Value of '$' environment variable :", value) (Python)Localizing var...