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format binary, octal, hexa numbers

a = 42

text = "{:b}".format(a)
print(text)   # 101010

text = "{:#b}".format(a)
print(text)   # 0b101010


a = 42

text = "{:o}".format(a)
print(text)   # 52

text = "{:#o}".format(a)
print(text)   # 0o52


a = 42

text = "{:x}".format(a)
print(text)   # 2a 

text = "{:#x}".format(a)
print(text)   # 0x2a

text = "{:#X}".format(a)
print(text)   # 0x2A