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convert bytes to a string

Jun 1, 2023CodeCatch
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collect dictionary

Nov 19, 2022CodeCatch

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from collections import defaultdict
def collect_dictionary(obj):
inv_obj = defaultdict(list)
for key, value in obj.items():
inv_obj[value].append(key)
return dict(inv_obj)
ages = {
'Peter': 10,
'Isabel': 10,
'Anna': 9,
}
collect_dictionary(ages) # { 10: ['Peter', 'Isabel'], 9: ['Anna'] }

read file contents into a list

Jun 1, 2023CodeCatch

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filename = "data.txt"
with open(filename, "r") as file:
file_contents = file.readlines()
file_contents = [line.strip() for line in file_contents]
print("File contents:")
for line in file_contents:
print(line)

return maximum

Nov 19, 2022CodeCatch

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def max_n(lst, n = 1):
return sorted(lst, reverse = True)[:n]
max_n([1, 2, 3]) # [3]
max_n([1, 2, 3], 2) # [3, 2]

Input 2D Matrix

Nov 19, 2022CodeCatch

0 likes • 2 views

# Input for row and column
R = int(input())
C = int(input())
# Using list comprehension for input
matrix = [[int(input()) for x in range (C)] for y in range(R)]

Sort a List of Strings

Oct 15, 2022CodeCatch

1 like • 2 views

my_list = ["blue", "red", "green"]
#1- Using sort or srted directly or with specifc keys
my_list.sort() #sorts alphabetically or in an ascending order for numeric data
my_list = sorted(my_list, key=len) #sorts the list based on the length of the strings from shortest to longest.
# You can use reverse=True to flip the order
#2- Using locale and functools
import locale
from functools import cmp_to_key
my_list = sorted(my_list, key=cmp_to_key(locale.strcoll))

print indices

Nov 18, 2022AustinLeath

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# List
lst = [1, 2, 3, 'Alice', 'Alice']
# One-Liner
indices = [i for i in range(len(lst)) if lst[i]=='Alice']
# Result
print(indices)
# [3, 4]