当我们在打印输出一个未被定义的变量时,Python 解释器就会为我们抛出一个 NameError 类型的错误,错误信息的描述是 : name 'name' is not defined 显示 名字 'name ' 没有被定义 异常 还有很多类型的异常错误,当程序抛出异常错误之后,程序就无法继续向下执行了.反而出现了一些错误的提示,这就是所谓的"异常" (2...
你看一下是不是 global 之前没有写进去缩进空格呀,我运行这段代码很正常。IsProcessed = False def func():global IsProcessed if IsProcessed:print("Processed")else:print("None")func()
set str1=abcd1233 set str2=ABCD1234 if %str1%==%str2% (echo 字符串相同!) else (echo 字符串不相同!) if /i %str1% LSS %str2% (echo str1^<str2) else (echo str1^>=str2) echo. set /p choice=是否显示当前时间?(y/n) if /i not %choice% EQU n echo 当前时间是:%date% %tim...
File"<string>", line 1,in<module> NameError: name'abc'isnot defined >>> a = input() "abc" >>> a 'abc' >>> type(a) <type'str'> >>> a = input() 1+3 >>> a 4 >>> a = input() "abc"+"def" >>> a 'abcdef' >>> value = 100 >>> a = input() value >>> a...
在编程中,使用或检查一个if条件中是否未定义是为了确保程序在执行时不会出现未定义的行为或错误。这种情况通常发生在变量或对象在使用之前没有被正确初始化或赋值的情况下。 为了检查一个if条件中是否未定义...
创建pandas dataframe时出现函数抛出'df not defined‘错误 、 我已经创建了一个函数,如下所示,用于从更大的数据帧创建数据帧 def prepare_data(cyl,typ): global variable_name global variable_name2 mask_bel1800 = (data_train_bel1800['Cycle'] == cyl) & (data_train_bel1800['Type'] == typ) ...
你要記住你成堆由 (resolve, reject)=>{xxx} 成舊野(your custom defined function) 都係叫 executor function 因為promise 個 class pre-set 左 有一句會 call executor(resolve, reject) 既然你明知人地會 call 一個 function 要入 parameter resolve, reject 你創建個個 function 就當然要有 resolve, rejec...
getting Traceback (most recent call last): main() NameError: name 'main' is not defined 1 python - the scope of variables inside "main" function Hot Network Questions Why was Z moved to the end of the alphabet when Zeta was near the beginning? What is the name for this ...
The correct way to subclassJSONEncoderis to overridedefault. (encoderisn't an existing method; it's not overriding anything and thus not being used.) classobj_to_json(JSONEncoder):defdefault(self, x):ifisinstance(x, person):return{"name": x.name1,"age": x.age1}return...
!/usr/bin/env python -*- coding: utf-8 -*- import os ls = os.linesep #为os.linesep取了一个别名 当前平台的换行符 while True:fname = raw_input('input a file name to save filenames:%s' % ls)if os.path.exists(fname):#os.path.exists(path)判断path是否存在 print ('...