使用python在文件中写入数据

Question

I am new in programming. Just bought a book for beginners in Python . In it I got this code:

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 ()

According to book its fine but I got this error:

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

I got no clue how to fix it and book isn't explaining this as well.

Answer 1

Let's go through this:

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

The close quotes are needed as has been pointed out.

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

outputString was missing a + before email

Finally, we need to rewrite you file management:

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

Writing this as a with statement guarantees it will close. Using open(..., "a") opens the file in "append" mode and lets you write multiple strings to a file of the same name.

Finally, if I can editorialize, I am not a fan of this book so far.

Edit: here is the whole code with fixes, in hopes of getting you there.

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) 

You can verify it works with:

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

Answer 2

I did some editing (closing quotes and a missing + ):

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()

You're getting that error because you're writing in binary mode, hence the b in wb for

file = open(fileName, "wb")

Try this instead :

file = open(fileName, "w")