Print Variable Name With a Dictionary in Python As discussed above, bothglobals()andlocals()functions return a dictionary that maps variables to their values. We can replicate that same functionality by creating a dictionary that contains variable names and their corresponding values in the form of...
In Python Variables are just the labels that are pointing to the values. They don't carry any built-in metadata about their names. That's why there is no direct built-in method to get the variable name as a string. However, we can achieve this, by inspecting the environment such as ...
NameError: name 'variable_name' is not defined是一个常见的 Python 错误,通常是由于变量未定义或拼写错误引起的。通过仔细检查代码、确保变量在使用前已定义、注意变量的作用域以及使用调试工具,你可以有效地解决这个问题。
1 Python 变量概述 变量,英文叫做 Variable。 从形式上看,每个变量都拥有独一无二的名字,通过变量的名字就能找到变量中的数据。 从底层看,变量是内存的名字。因为程序中的数据最终都要放到内存中。 2 Python 变量的命名 变量名是标识符的一种,不能随便起,必须要遵守 Python 标识符命名规则。
When the code is executed, theglobal_varglobal variable is printed first, followed by the local variable:outer_varandinner_varwhen the outer and inner functions are called. Example 2: Use of global Keyword in Python # define global variableglobal_var =10defmy_function():# define local variab...
# 错误示例1:拼写错误 result = unknown_variable # NameError,因为unknown_variable未定义 错误二:作用域问题 代码语言:javascript 代码运行次数:0 运行 AI代码解释 def my_function(): print(my_var) # NameError,因为my_var在函数外部未定义 错误三:导入错误 代码语言:javascript 代码运行次数:0 运行 AI代码...
x= 222 # 当此处定义了x=222时此处出现的语法逻辑上错误,针对变量需要先定义后使用func()#报错: UnboundLocalError: local variable 'x' referenced before assignment #实例5:x = 111deffunc(): x= 222#为避免实例4的错误,应在此处定义xprint(x)#x = 222func() ...
本题考查Python变量。在Python中,变量名只能包含字母、数字和下划线,且不能以数字开头。选项A“my_vAriABle”、选项B“_privAte_vAr”和选项D“vAriABle_nAme”都符合变量命名规则。而选项C“1.st_vAr”以数字开头并且包含了不允许的字符“.”,不符合Python的变量命名规则,所以不是合法的变量名。故答案为:C。反馈...
Dark magics about variable names in python CHANGELOG|API|Playground| 🔥StackOverflow answer Installation pip install -U varname Note if you usepython < 3.8, installvarname < 0.11 Features Core features: Retrieving names of variables a function/class call is assigned to from inside it, usingvar...
那么在其他 Python 脚本中导入这个模块时，可以使用以下代码：Python中的__name__是一个magic variable...