python basic data type number

1. Numbers 

 Integer: int ()   converts a string or number to an integer　  

int(4.5)
int('123')

 2, 8, hexadecimal to decimal

int('1010',2) '' is the number to be converted, 2 is used to indicate what base the preceding number is
int('36',8)
int('a',16)

   Decimal →   →  Convert to binary bin() Convert to octal oct() Convert to hexadecimal hex()

  float  ()   converts integers and strings to floats    

float(2)  
<<<2.0
float('123')
<<<123.0

The # type() function returns the type of the object  if you have only the first parameter , and the new type object for the three parameters.

a='123'
b=456
print(type(a),type(b))
<class 'str'> <class 'int'>

- bit_lenght() # The binary of the current number, represented by at least n bits (the string cannot be measured)

age=23
r = age.bit_length()