How and when do you use the colom?

Answer 1

and don't forget the walrus operator :=

Answer 2

colon is used with ->

if...:
...
elif...:
...
else:
...
----
try...:
...
except...:
...
----
while ...:
----
for ...:
----
def my_func(...): (defining user functions)
...
----
class Coordinates(): (defining a class)
...
----

After each colon, next line has to be indented, except the following case ->
----
Colon is also used with slices ->
inp[3:10]
----
creating dictionary to separate key : values

Answer 3

Conditions, loops, dictionaries, some arguments require them too

Answer 4

Oh and don't forget Lambdas 😉

Answer 5

Collecting things in common is called swarm intelligence. 😂😂🤣