Types conversion#
Python has several useful built-in features that allow data to be converted from one type to another.
int
#
int
converts a string to int:
In [1]: int("10")
Out[1]: 10
Using int
function you can convert a binary number into a decimal number (binary number must be written as a string)
In [2]: int("11111111", 2)
Out[2]: 255
bin
#
You can convert a decimal number to binary format with bin
:
In [3]: bin(10)
Out[3]: '0b1010'
In [4]: bin(255)
Out[4]: '0b11111111'
hex
#
A similar function exists for conversion to hexadecimal format:
In [5]: hex(10)
Out[5]: '0xa'
In [6]: hex(255)
Out[6]: '0xff'
list
#
Function list
converts an argument to a list:
In [7]: list("string")
Out[7]: ['s', 't', 'r', 'i', 'n', 'g']
In [8]: list({1, 2, 3})
Out[8]: [1, 2, 3]
In [9]: list((1, 2, 3, 4))
Out[9]: [1, 2, 3, 4]
set
#
Function set
converts an argument into a set:
In [10]: set([1, 2, 3, 3, 4, 4, 4, 4])
Out[10]: {1, 2, 3, 4}
In [11]: set((1, 2, 3, 3, 4, 4, 4, 4))
Out[11]: {1, 2, 3, 4}
In [12]: set("string string")
Out[12]: {' ', 'g', 'i', 'n', 'r', 's', 't'}
This function is very useful when you need to get unique elements in a sequence.
tuple
#
Function tuple
converts argument into a tuple:
In [13]: tuple([1, 2, 3, 4])
Out[13]: (1, 2, 3, 4)
In [14]: tuple({1, 2, 3, 4})
Out[14]: (1, 2, 3, 4)
In [15]: tuple("string")
Out[15]: ('s', 't', 'r', 'i', 'n', 'g')
This can be useful if you want an immutable object.
str
#
Function str
converts an argument into a string:
In [16]: str(10)
Out[16]: '10'