Plastic -int
It used to calculate and compare
Py 3 only int
There Py2 int and long (eg: 3213123434534L, the suffix L indicates that it is a long type)
Specific range:
2**31~2**(31-1) int 2**63~2**(63-1) long
Hexadecimal conversion
Decimal - 2 binary
- Divisible by 2, to get the remainder, the output binary remainder, in turn, written from bottom to top, that is his binary.
| Dividend | remainder |
|---|---|
| 15 | 1 |
| 7 | 1 |
| 3 | 1 |
| 1 | 1 |
| 0 |
15 ---> 1111
- bin (xxx): Decimal Binary transfer
- eg: print (bin (15)) = 0b1111 0b binary flag
Binary --10 hex
eg: 1010 from right to left
1010 = 0 * 2**0 + 1 * 2**1 + 0 * 2**2 + 1 * 2**3* 2 ** 0 0 0 The first digit is '1010' is, 2 is converted to binary, 0 is due to the second bit represents 0 power (power of ten represents 1, one hundred 2 represents the power of thousands of delegates to the third power)
int ( '' xxx '', several hex) to convert the radix "xxx" in decimal
eg: int ( "1010", 2) to convert the binary to decimal 1010
print(int("1010",2)) = 10
to sum up:
- Integer data type is immutable
- Can be modified in situ called variable data type, it can not be modified in situ immutable data types, called
- id () View the memory address space