python - NameError:名称 'x' 未定义 Python

Question

我正在尝试解决此错误，但找不到解决方案。实际上，这段代码在一段时间内运行良好，但突然开始出现错误:

"NameError: name 'number_exit' is not defined" 

还有:

"NameError: name 'price_buy' is not defined"

代码正在生成一个随机数列表

import numpy as np

# This function generates a list of numbers under certain rules
def num_var_list():
    global number_list, number_exit, number_target
    number_list = []
    number_target = number_exit
    num_max_robot = (number_target * 20) / 100
    while num_max_robot > 0:
        num_robot = np.random.randint(1,int(num_max_robot))
        if num_robot > number_target:
                number_list.append(number_target)
        else: 
            number_list.append(num_robot)
        number_target = number_target - number_target
    return number_list
        
# This function generates a random number between a certain range
def fun_price_buy():
    global price_buy
    price_buy = np.random.randint(50000,300000)
    return price_buy

# This function generates a random number between a certain range
def fun_mx_buy():
    global number_exit
    number_exit = np.random.randint(50, 150)
    return number_exit

lista_number_list = []
lista_price_buy = []
lista_mx_buy = []

# This loop append each function 50 times to a new list
while len(lista_price_buy) <= 50: 
    lista_number_list.append(num_var_list())
    lista_price_buy.append(fun_price_buy())
    lista_mx_buy.append(fun_mx_buy())

实际上，当 Python 没有删除错误时，代码完全符合我的要求。所以我不确定如何调整它以让它在没有 NameError 警告的情况下工作。

任何帮助将不胜感激。谢谢!

Answer 1

当执行 global price_buy 时，这意味着您使用全局定义的 price_buy 在您的方法中本地定义，但是

• price_buy 和 number_exit 都不是全局定义的(在方法之外)
• 你不需要全局变量

它们只是本地的，而且更好:内联

def fun_price_buy():
    price_buy = np.random.randint(50000,300000)
    return price_buy

# inline, no temporaty variable is needed
def fun_price_buy():
    return np.random.randint(50000,300000)

---

最后，如果您想从变量中的方法中获取值以对其执行某些操作:

import numpy as np

# This function generates a list of numbers under certain rules
def num_var_list(number_exit):
    number_list = []
    number_target = number_exit
    num_max_robot = (number_target * 20) / 100
    while num_max_robot > 0:
        num_robot = np.random.randint(1,int(num_max_robot))
        if num_robot > number_target:
                number_list.append(number_target)
        else: 
            number_list.append(num_robot)
        number_target = number_target - number_target
    return number_list
        
def fun_price_buy():
    return np.random.randint(50000,300000)

def fun_mx_buy():
    return np.random.randint(50, 150)

lista_number_list = []
lista_price_buy = []
lista_mx_buy = []

# This loop append each function 50 times to a new list
while len(lista_price_buy) <= 50: 
    number_exit = fun_mx_buy()
    price_buy = fun_price_buy()
    vr_list = num_var_list(number_exit)
   
    lista_number_list.append(vr_list)
    lista_price_buy.append(price_buy )
    lista_mx_buy.append(number_exit )