使用两个函数时出现“NameError: name '' is not defined”

Question

我正在使用一个函数来创建用户名和另一个函数来创建密码。第二个函数没有运行，因为它告诉我“NameError: name 'list_two' is not defined”。这是我的代码：

import random
import openpyxl

path = "E:\\Desktop\\"

wb = openpyxl.load_workbook('excel.xlsx')
sheet = wb.active

def name_generator():
    usernames = list()
    for username in range (0, 34):
        color = ["Red", "Green", "Blue", "White", "Black", "Yellow", "Purple", "Orange", "Pink"]
        animal = ["Cat", "Dog", "Snake", "Mouse", "Tiger", "Leopard", "Moose", "Wolf", "Bear"]
        number = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10",
                  "11", "12", "13", "14", "15", "16", "17", "18", "19", "20"]

        randomColor = random.randrange(0, len(color))
        randomAnimal = random.randrange(0, len(animal))
        randomNumber = random.randrange(0, len(number))

        username = "Username: " + color[randomColor] + animal[randomAnimal] + number[randomNumber]
        usernames.append(username)
    return usernames

list = name_generator()

for i in range(1,34):
    cellref = sheet.cell(row=i, column=5)
    cellref.value=list[i]

def password_generator():
    passwords = list_two()
    for password in range (0, 34):
        color = ["Red", "Green", "Blue", "White", "Black", "Yellow", "Purple", "Orange", "Pink"]
        animal = ["Cat", "Dog", "Snake", "Mouse", "Tiger", "Leopard", "Moose", "Wolf", "Bear"]
        number = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10",
                  "11", "12", "13", "14", "15", "16", "17", "18", "19", "20"]

        randomColor = random.randrange(0, len(color))
        randomAnimal = random.randrange(0, len(animal))
        randomNumber = random.randrange(0, len(number))

        password = "Password: " + color[randomColor] + animal[randomAnimal] + number[randomNumber]
        passwords.append(password)
    return passwords

list_two = password_generator()

for i in range(1,34):
    cellref = sheet.cell(row=i, column=6)
    cellref.value=list_two[i]

wb.save('excel_mod.xlsx')
input("Done")

我不太确定问题出在哪里。为什么它适用于第一个功能而不适用于第二个功能？我尝试了不同的 shell，但它给了我同样的错误，所以我猜测代码在某种程度上是错误的。

Answer 1

您使用list_two = password_generator()，但该函数的第一行是passwords = list_two()，但此时尚未定义list_two——它只有在函数完成后才会有一个值。此外，它可能是一个列表，因此不可调用。您可能想将其初始化为一个空列表，例如使用passwords = [] 或passwords = list()，就像你在name_generator 中所做的那样。

Answer 2

由于其他答案已经解决了名称错误发生的原因，因此此答案仅用于澄清first 函数和second 函数之间的区别，如本问题所述：

为什么它适用于第一个函数而不适用于第二个函数？

#first function
def name_generator():
    usernames = list()             #<--- makes a list
    ...
    ...
    return usernames
list = name_generator()            #<--- assigns to a variable NAMED list

#second function
def password_generator():
    passwords  = list_two()        #<--- ERROR: list_two is not defined as a function prior to this line
    ...
    ...
    return passwords
list_two = password_generator()    #<--- assigns to a variable NAMED list_two

Answer 3

它给你的完整错误信息是什么？

另外，建议不要使用list作为变量名。

例如：

list 在list = name_generator()。最好使用描述性更强的变量名，当您需要回顾您的代码或其他人需要阅读您的代码时，您会感谢自己。

另外，只需使用usernames = [] 创建一个空列表类型。