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)