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Beginner at Python. Trying to count certain integer from random string of code - kiaspelleditwrong - Oct-14-2019
I hope my title wasn't too long. I have code to make a random string of numbers; 0 or 1. I want it to count and print how many times 1 appears in the string of numbers. This is what i have so far:
import random def Rand(Start, end, num): res = [ ] for j in range (num): res.append(random.randint(start, end)) return res num = 1000 start = 0 end = 1 pie = (Rand(start, end, num)) def count(lst): return sum(lst) lst = pie print(count(lst))I feel that i have no idea if its actually counting whether its 1 or not. I'm kind of figuring there's a better way to do what I'm trying to accomplish. Thanks for helping!
RE: Beginner at Python. Trying to count certain integer from random string of code - perfringo - Oct-14-2019
Python strings have method .count() for counting purpose:
>>> s = '1100101' >>> s.count('1') 4 RE: Beginner at Python. Trying to count certain integer from random string of code - Malt - Oct-14-2019
(Oct-14-2019, 05:38 AM)perfringo Wrote: Python strings have method .count() for counting purpose:
>>> s = '1100101' >>> s.count('1') 4
It is working for list as well
>>> s=['1','0','1','0','1','1','0'] >>> s.count('1') 4 RE: Beginner at Python. Trying to count certain integer from random string of code - perfringo - Oct-14-2019
For counting hashable items there is collections.Counter().
>>> from collections import Counter >>> s = '1100101' >>> Counter(s) Counter({'1': 4, '0': 3}) >>> Counter(s)['1'] 4Writing your own counter for specific needs is pretty simple. Following is counting even numerics in a string (it will raise ValueError if character is not numeric):>>> numeric = '23542' >>> sum(1 for char in numeric if int(char) % 2 == 0) 3