Python error in coding

Python Help
,
1 
for i in range(4):
    print("printing inside forloop")
else:
   print("printing in else, which shouldn't be")
2

The else clause of a for loop runs unless the loop is exited via a break.

for i in range(4):
    print("printing inside for loop")
    if i == 3:
        break
else:
    print("This won't print")
3

Why do you think this is an error?

4

Thanks, but

  1. Does the for-else serve any purpose/use case?
  2. If it doesn’t close well, perhaps we could use the “if n else” statement only. I expect the interpreter to throw an error: ‘else’ without a previous ‘if’.
5

because I expect that code (for loop + else) to be interpreted in this way,

while cond True:
    # do this
else:
    break
else:
    print("printing in else, which shouldn't be")

which is now interpreted as

while True:
    # do this
else:
    print("printing in else, which shouldn't be")
6

In the context of a for statement you can pretend that the else means nobreak.

1 Like
7

I forget, once a month, which case the else block of the for statement and while statement is executed.
The for..else or while...else syntax is more difficult than the English phrase “unless otherwise explicitly…”
The nobreak is useful to remember. :slight_smile: