python基本数据类型之整型

整形常带功能

1.int

将其他数据类型变成整型，如字符串

a = "123"  
v = int(a) 
print v

num = "b"
v = int(num, base=16) # base是指将数字转为16进制
print(v)

2.bit_length:显示整数转为二进制时的长度

bit_length(...)
      int.bit_length() -> int
       
       Number of bits necessary to represent self in binary.
       >>> bin(37)
       '0b100101'
       >>> (37).bit_length()
       6

age = 5
r = age.bit_length()
print(r)

>>> 3