Python's.replace() 究竟是如何工作的？

Question

I was trying to replace two different characters @ and . in a string with one character | . When I assign the replacing variable to the same variable, the replacing of @ and . to | works, but using different variable, it only replace dot to | . May I know what's the reason causing the difference?

Using same variable:

email = input("Please enter your email address : ")
for x in ('@','.'):
     email = email.replace(x,'|')
print(email)

Output:

Please enter your email address : sdf@sadfs.com
sdf|sadfs|com

Using other variable:

email = input("Please enter your email address : ")
for x in ('@','.'):
     temp_email = email.replace(x,'|')
print(temp_email)

Output:

Please enter your email address : sdf@sadfs.com
sdf@sadfs|com

Answer 1

In the first loop, you're overwriting email both times, when the loop executes

email = email.replace(x,'|')

In the second loop, you store it in temp_email , so email isn't overwritten. When we execute

temp_email = email.replace(x,'|')

the first time, x='@' , so temp_email becomes sdf|sadfs.com . Then the second time it's executes, x='.' , so temp_email becomes sdf@sadfs|com . This is because both times it's editing email to create temp_email , but email hasn't been changed!

Answer 2

At first execution of your (for) loop will turns @ to '|' Temp_email = sdf@sadfs.com

But email is un changed

so email = sdf@sadfs.com

At second execution of your (for) loop will turns. to '|'

Then

Temp_email = sdf@sadfs|com

Then it prints

Here is your Expected Code

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