When a variable is assign by :, what does this mean?

Asked Apr 12 '19 at 14:41

Active Apr 12 '19 at 16:00

Viewed 56 times

I saw a piece of code, which looks like this.

a=3
test: a=2
print(test) # test = 2
print(a)    # a = 3

I don't know why a remained unchanged, and test is assigned successfully.

Also, I found that if I do not define a in advance, there will be errors.

I don't know what the keyword of the syntax is as well as the purpose.

I hope that you can answer the question.

edited Apr 12 '19 at 16:00

Nathan

asked Apr 12 '19 at 14:41

楊雅涵

When I try this code, I get a syntax error in Python 3.5.2. – RemcoGerlich Apr 12 '19 at 14:43
1

python 3.7 works fine – deathangel908 Apr 12 '19 at 14:44
1

You've probably seen the more familiar syntax: `name: str = "someone"` – rdas Apr 12 '19 at 14:48
@RemcoGerlich That notation was added 3.6+ (If you haven't see the duplicate answer yet) – Error - Syntactical Remorse Apr 12 '19 at 16:12

0 Answers0