How print work in this case?

Question

words = ["hello", "world", "spam", "eggs"]
#for words in words:
print(words + "!")

This snippet is not working

words = ["hello", "world", "spam", "eggs"]
for words in words:
print(words + "!")
This works how print different in both cases

Answer 1

In:

words = ["hello", "world", "spam", "eggs"]
#for words in words:
print(words + "!")

You tried to concatenate a list ["hello", ... "eggs"] and a string "!", which raised an error.

In:
words = ["hello", "world", "spam", "eggs"]
for words in words:
print(words + "!")

An indentation error would have been raised because a codeblock statement lacked required indent.

Fixed. in:
words = ["hello", "world", "spam", "eggs"]
for words in words:
print(words + "!")

Program concatenated:
"hello" + "!"
"world" + "!"
"spam" + "!"
"eggs" + "!"

And printed:
hello!
world!
spam!
eggs!

Answer 2

Because the first for is an comment?