set mai + - wala operation bhi hota hai

a.split() -> break with the space,
eg: return True if 'dog' in a.lower().split() else False

map(fxn,seq)
filter(fxn,seq)
k = filter(lambda a:a[0]=='s',seq)
print(list(k))

s.lower()
s.upper()

ord ->ordinal -> A ->65
chr ->chara ->65->A