未绑定本地错误，我不知道如何修复

Question

def perd(): 

    Personaldetails_file = open("Personaldetails_file.txt", "w") 
    Personaldetails_file = open("Personaldetails_file.txt", "a") 

    pd = input("Are you a new user?") 

    if pd == "yes": 
     print ("Add your details") 
    ####################################  
    age = int(input("how old are you?")) 
    DOB = input("Date of birth:") 
    gender = input("Gender:") 
    weight = int(input("weight in kg:")) 
    height = int(input("height in cm:")) 

    Personaldetails = (age, DOB, gender, weight, height) 

    Personaldetails_file.write(str(Personaldetails)) 
    Personaldetails_file.close() 

    ####################################### 


def td(): 

    choice = input("which trainning event would you like to access?\n1.swimming\n2.cycling\n3.running\nplease type in the number before the event of which you want to choose\n") 
    if choice == "1": 
     Swimming_file= open("Swimming_file.txt", "w") 

     totaldistance = input("what was the total distance you swam in meters?") 
     totaltime = input("how long did you swim for in minutes?") 
     speed = totaldistance/totaltime 
     print ("on average you where running at a speed of", speed, "mps\nyou can look at the tables to see how many calouries you have burnt") 

     total = (totaldistance, totaltime, speed) 
     Swimming_file.write(str(total)) 
     Swimming_file.close() 

    elif choice == "3": 
     Running_file= open("Running_file.txt", "w") 


     totaldistanceR = int(input("what was the total distance you ran in KM?")) 
     totaltimeR = int(input("how long did you run for in minutes?")) 
     totaltimeR1 = 60/totaltimeR 
     speedR1 = totaldistanceR/totaltimeR1 
     calburn = (speedR1 * 95)/(60/totaltimeR1) 

     print ("\nThe records have been saved") 
     print ("\non average you where running at a speed of", speedR1, "KMph\nyou burnt",calburn," calouries\n") 

     totalR = (totaldistanceR, totaltimeR, speedR1, calburn) 
     Running_file.write(str(totalR)) 
     Running_file.close() 
    ############################################################## 
    elif choice == "2": 
     Cycling_file= open("Cycling_file.txt", "w") 
     with open("Personaldetails_file.txt", "r") as f: 
     content = [x.strip('\n') for x in f.readlines()] 
     lines = f.readlines() 
     for line in lines: 
      words = line.split(",") 
      age = (line.split)(0) 
      weight = (line.split)(3) 
      height = (line.split)(4) 
################################################################    
     totaldistancec = int(input("what was the total distance you cycled in KM?")) 
     totaltimec = int(input("how long did you cycle for in minutes?")) 
     calburn1 = (13.75 * weight) + (5 * height) - (6.67 * age)     
     speedc = totaldistancec/totaltimec 
     print ("on average you where running at a speed of", speedc, "KMph\nyou burnt", calburn1, " calouries") 

     totalc = (totaldistancec, totaltimec, speedc) 
     Cycling_file.write(str(totalc)) 
     Cycling_file.close() 
     Personaldetails_file.close() 

当我解开程序时出现错误。 线84，在TD calburn1 =（13.75 *重）+（5×高度） - （6.67 *年龄） UnboundLocalError：分配 之前引用局部变量 '重量' 没有人知道我该如何解决这个问题？ 这是有关通过“＃”包围了问题的代码

Answer 1

您申报重量这里

def perd(): 

... 
    gender = input("Gender:") 
    weight = int(input("weight in kg:")) 
    height = int(input("height in cm:")) 

... 

，但你尝试在这个其他功能在这里使用它：

def tr(): 
    .... 
    calburn1 = (13.75 * weight) + (5 * height) - (6.67 * age) 
    .... 

这是一个单独的函数不知道perd()函数中的变量，为什么要这样呢？它不需要它们中的任何一个来作为功能进行操作，以隔离代码段并且能够被自己使用。换句话说，一旦perd()运行，其局部变量超出范围。看看这个问题，Short Description of the Scoping Rules?。要解决这个问题，你需要在perd()全球范围内输入，不可取，因为它不是pythonic。或者，您可以将值作为函数参数如下所示：

td(weight, height, age): 
    #code here 

现在您可以访问td函数中作为权重传入的值。但是你需要认识到这些变量不是同一个变量，它们可能共享相同的名称，但它们不一样。您将需要从perd函数中传入想要使用的所有值。这是可取的，因为您正在设计功能的方式可以使用模块化，所以可以处理来自用户的输入，而另一个可以对已知的有效数据执行计算，这使得更容易阅读代码，这是python的全部内容