Python，repl.it - 未使用 csv.writer 和 writer.writerow 将详细信息写入文件

Question

我有以下 repl.it 程序，并注意该程序的注册部分，之前运行良好，已停止运行。

它到最后说“写入文件”，但不知何故实际的 write-rows 命令被跳过，因为没有任何东西写入文本文件。

整个程序都在这里：

https://repl.it/@oiuwdeoiuas/Matchmakingskills-1

代码的相关部分如下，虽然可能有其他因素（因此提供了整个代码）

def register():
    print("===Register====")
    print("First things first, sign up and tell us a little about yourself")
    with open("dating.txt","a") as fo: 
        writer=csv.writer(fo)        
        firstname=input("Enter first name:")
        lastname=input("Enter last name:")
        username=firstname+lastname[0]+"bird"
        print("Your automatically generated username is:",username)
        password=input("Enter password:")
        gender=input("Enter gender")
        email=input("Enter email:")
        dob=input("Enter date of birth in format dd/mm/yy:")
        beliefs=input("Enter beliefs")
        strengthslist=["patience","efficiency","sensitivity","frankness","submissiveness","leadership","timekeeping","laidback"]
        print(strengthslist)
        strengths=input("Enter your top strength: (select from the above list)")
        contactcount=0
        writer.writerow([username,password,firstname,lastname,gender,email,dob,beliefs,strengths,contactcount])
        print("written to file")
        mainmenu()

Answer 1

您正在尝试读取仍然打开的文件：

def register():
    # ...
    with open("dating.txt","a") as fo: 
        # ...
        print("written to file")
        # At this point, "dating.txt" hasn't been written to
        # the next call to open it that occurs here will
        # see the state of the file either partially written, or before
        # the row is written at all
        mainmenu()

有几个解决方案。最快的是在此处将mainmenu() 取消缩进一级：

def register():
    # ...
    with open("dating.txt","a") as fo: 
        # ...
        print("written to file")
    # dating.txt has been closed now, it's safe to read it
    mainmenu()

当下一个方法出现并尝试读取文件时，它将以这种方式包含预期的数据。

Answer 2

我可能错了，但你需要writerows 而不是writerow，因为writerows 像你一样接受列表，writerow 接受列。

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