import re / re.search / re.match / re.compile
rjust / zfill / split
x.copy() / import copy / copy.copy(x) / copy.deepcopy(x)
for ~ enumerate / while / break / continue / if ~ else
append() / extend() / insert() / del / remove / pop / count() / index() / set
sort() / sorted /get()
lambda
map(lambda x: x, variable) / filter(lambda x: x, variable)