Where's is the place to get python challenges and contests.

Answer 1

In Sololearn, you can try coding challenges:
https://www.sololearn.com/learn/4532/?ref=app
https://www.sololearn.com/learn/4943/?ref=app

Answer 2

You use this sites for python challenges:
hackerrank
codingbat
codechef
hackerearth
programmr

Answer 3

https://www.codewars.com/?language=JUMP_LINK__&&__python__&&__JUMP_LINK

Answer 4

If you use android you should look for an icon like this ⚡