使用python在文件中写入数据

Question

我是编程新手。刚在Python为初学者买了一本书。在里面我有个密码：

name = input("name")
email = input("whats ure email:) 
favoriteband = input("ure fav band") 
outputString = name + "|" email + "|" + favoriteband 
fileName = name + ".txt"
file = open(fileName, "wb") 
file.write (outputString) 
print (outputString , " saved in ", fileName) 
file.close ()

根据这本书，它很好，但我有一个错误：

TypeError: a bytes-like object is required, not 'str'

我不知道该怎么修，书也没有解释

Answer 1

我做了一些编辑（右引号和缺少的+）：

name = input("name:")
email = input("whats ure email:")
favoriteband = input("ure fav band:")

outputString = name + " | " + email + " | " + favoriteband 
fileName = name + ".txt"
file = open(fileName, "w") #opened in write mode but not in binary
file.write (outputString) 
print (outputString , " saved in ", fileName) 
file.close()

得到这个错误是因为您是以二进制模式编写的，因此b中的wb

file = open(fileName, "wb")

请尝试以下操作：

file = open(fileName, "w")

Answer 2

我们来看看这个：

name = input("Your name: ")
email = input("Your email: ")

正如已经指出的那样，我们需要简短的引述

outputString = name + "|" + email + "|" +  favoriteband 

outputString在email之前缺少一个+

最后，我们需要重写您的文件管理：

with open(fileName, "a") as file:
  file.write (outputString) 
  print (outputString , " saved in ", fileName) 

把它写成with语句可以保证它会关闭。使用open(..., "a")以“append”模式打开文件，并允许您向同名文件写入多个字符串

最后，如果我能发表社论的话，到目前为止我还不是这本书的粉丝

编辑：这里是完整的代码与修复，希望让你到那里

name = input("name")
email = input("whats ure email:") 
favoriteband = input("ure fav band") 
outputString = name + "|" + email + "|" +  favoriteband 
fileName = name + ".txt"
with open(fileName, "a") as file:
  file.write (outputString) 
  print (outputString , " saved in ", fileName) 

您可以验证它是否适用于：

with open(fileName, "r") as file:
  print(file.read())