如何访问在模块内部定义的变量？

Question

所以在写一些模块的程序 内使用，但使用i中的模块的前内定义变量时遇到的困难：

a.py

def func(): 
    #do something to set the variable var 
    var = randomValue 

b.py

from a import func 
func() 
#how do i get var 

我将var设置为全局，但仍未定义var。

所有这些答案看起来不错，但没有任何主题为我的脚本工作。因此，这里的模块，也许你能告诉我怎么去time_converted到另一个脚本：

from ib.opt import Connection, message 
import time 
import datetime 

list_time = [] 
global time_converted 
def reply_handler(msg): 
    if msg.typeName == "currentTime": 
     time = msg.time 
     list_time.append(time) 
     time_converted = (datetime.datetime.fromtimestamp(int("%s"% time 
                  )).strftime('%Y-%m-%d %H:%M:%S')) 
     return time_converted 



def GetTime(): 
    conn = Connection.create(port=7496, clientId=100) 
    conn.registerAll(reply_handler) 
    conn.connect() 
    conn.reqCurrentTime() 
    while True: 
     if len(list_time) == 0: 
      pass 
     elif len(list_time) == 1: 
      break 
      conn.disconnect() 

Answer 1

a.py

from random import random 

def func(): 
    var = random() 
    return var 

x = func() 

b.py

from a import func,x 

print (func(), x) 

从执行b.py输出：

0.2927063452485641 0.8207727588707955 

编辑，响应于修改的问题

当reply_handler本身收到回调来处理它使用另一个回调到它的结果报告给主代码的时间。

使用一个回调函数..

1.py

from main import receiver 

def GetTime(): 
    reply_handler('this is the time') 

def reply_handler(msg): 
    receiver(msg) 

GetTime() 

main.py

def receiver(message): 
    print (message) 

输出：

this is the time 

Answer 2

你定义一个函数内部的变量。要使该变量的值在函数外部可用，您需要使用return语句。举个例子：

a.py

def func(): 
    # do something to set the variable `var` 
    var = 10 

    return var 

b.py

from a import func 

# to get var 
var = func() 
print('The value of var is:', var) 

有关的功能和return语句更多解释见here。

Answer 3

所以这就是我应该这样做的：

GetPrice。PY

from ib.opt import Connection, message 
import datetime 

    list_time = [] 
    def reply_handler(msg): 
     if msg.typeName == "currentTime": 
      time = msg.time 
      list_time.append(time) 
      global time_converted 
      time_converted = (datetime.datetime.fromtimestamp(int("%s"% time 
                   )).strftime('%Y-%m-%d %H:%M:%S')) 


    def GetTime(): 
     conn = Connection.create(port=7496, clientId=100) 
     conn.registerAll(reply_handler) 
     conn.connect() 
     conn.reqCurrentTime() 
     while True: 
      if len(list_time) == 0: 
       pass 
      elif len(list_time) == 1: 
       break 
       conn.disconnect() 

     return time_converted 

Main.py

from GetRealtime import GetTime 

x = str(GetTime()) 
print (x) 

感谢您的帮助球员