AOC day 5

#!/usr/bin/env python3

import re

crates=""
steps=""

def parse_crates(crates):
    crates_list=[[] for num in crates.split("\n")[-2] if num.isnumeric()]
    crates=crates.split("\n")[:-2][::-1]

    for row in crates:
        row=re.sub("[\[\]]","",row)
        row=re.sub("(\s\s\s\s)"," ",row).split(" ")
        [crates_list[i].append(row[i]) for i in range(len(row)) if row[i]]
    return crates_list

with open("input.txt") as file:
    for line in file:
        if line.strip():
            crates+=line
        else:
            break
    commands_list=file.read().split("\n")[:-1]


crates_list=parse_crates(crates)
for command in commands_list:
    count, from_stack, to_stack=[int(i) for i in re.findall("\d+", command)]
    for _ in range(count):
        crates_list[to_stack-1]+=crates_list[from_stack-1].pop()

print("".join([ch.pop() for ch in crates_list]))

#############################################################################################

#!/usr/bin/env python3

import re

crates=""
steps=""


def parse_crates(crates):
    crates_list=[[] for num in crates.split("\n")[-2] if num.isnumeric()]
    crates=crates.split("\n")[:-2][::-1]

    for row in crates:
        row=re.sub("[\[\]]","",row)
        row=re.sub("(\s\s\s\s)"," ",row).split(" ")
        [crates_list[i].append(row[i]) for i in range(len(row)) if row[i]]
    return crates_list

with open("input.txt") as file:
    for line in file:
        if line.strip():
            crates+=line
        else:
            break
    commands_list=file.read().split("\n")[:-1]


crates_list=parse_crates(crates)
for command in commands_list:
    count, from_stack, to_stack=[int(i) for i in re.findall("\d+", command)]

    stack=[]
    for _ in range(count):
        stack+=crates_list[from_stack-1].pop()
    crates_list[to_stack-1]+=stack[::-1]
print("".join([ch.pop() for ch in crates_list]))