Python Type Casting or Type Conversion Example Tutorial

Type Casting or Conversion in Python

Python programming language has built-in support for various data types. Some times, the programmers need Type Conversion or Type Casting support in Python. Let us know more in this Last Minute Python tutorial with examples.

Type Conversion is also called Parsing if it involves Strings.

You can check the compiling and running a python program article before experimenting with these examples below.

Python Type Casting or Type Conversion

Converting one type of data into another type is called Type Casting or Conversion. Most of the conversions in Python are explicit in nature using some functions or methods.

Below is the list of allowed type conversions with numeric data.

  • int to float conversion
  • int to complex conversion
  • float to int conversion
  • float to complex conversion

Float to int conversion is always lossy.

Below is the list of invalid type casting or conversions with numeric data.

  • complex to int conversion
  • complex to float conversion

Below is the list of possible type conversions or parsings between string and numeric types.

  • str to int
  • str to float
  • str to complex
  • int to str
  • float to str
  • float to complex

Below is the list of possible conversion between bool and other data types.

  • int to bool
  • float to bool
  • complex to bool
  • string to bool
  • bool to int
  • bool to float
  • bool to complex

Below is the list of possible or allowed type conversions among Sequences.

  • range to list
  • range to tuple
  • range to set
  • list to tuple
  • list to set
  • tuple to list
  • tuple to set
  • set to list
  • set to tuple
  • set to str
  • tuple to str
  • range to str
  • list to str

Example 1:

a = 10
b = float(a) #int to float conversion
print(b)
#output
10.0

c = complex(a) #int to complex conversion
print(c)
#output
(10+0j)

d = 15.5 #float
e = int(d) #float to int conversion
print(e)
#output
15

f = complex(d) #float to complex
print(f)
#output
(15.5+0j)

Example 2:

str_a = '15'
int_a = int(str_a) #string to int conversion
print(int_a)
#output
15

print(int_a + 1)
#output
16


str_b = '25.89'
float_b = float(str_b) #string to float conversion
print(float_b)
#output
25.89

int_b = int(float_b) #float to int conversion
print(int_b)
#output
25

str_c = '25+3J'
con_c= complex(str_c) #string to complex conversion
print(con_c)
#output
(25+3j)

TIP: It is a good practice to parse numbers in a string (str) format to float first and int conversion next. If you directly cast a float value inside the string to int, you will get an error like "ValueError: invalid literal for int() with base 10".

You can convert a bool type value to an int without using the int() method. This conversion is implicit or automatic.

Example 3:

boolean = True
a = 10 + boolean #boolean to int conversion
print(a)
#output
11

bool1 = bool(3) #int to bool conversion
print(bool1)
#output
True

bool2 = bool(5.5) #float to bool conversion
print(bool2)
#output
True

bool3 = bool('abc') #string to bool conversion
print(bool3)
#output
True

bool4 = bool(5+6j) #complex to bool conversion
print(bool4)
#output
True

Example 4:

list1 = [5, 7, 9, 11, 15]
tuple1 = tuple(list1) #list to tuple
print(tuple1)
#output
(5, 7, 9, 11, 15)

set1 = set(list1) #list to set
print(set1)
#output
{5, 7, 9, 11, 15}


list2 = list(set1) #set to list
print(list2)
#output
[5, 7, 9, 11, 15]

list3 = list(tuple1) #tuple to list

set5 = set(tuple1) #tuple to set
tuple5 = tuple(set5) #set to tuple


range1 = range(0,6)
list4 = list(range1) #range to list
print(list4)
#output
[0, 1, 2, 3, 4, 5]

set4 = set(range1) #range to set
print(set4)
#output
{0, 1, 2, 3, 4, 5}

tuple4 = tuple(range1) #range to tuple
print(tuple4)
#output
(0, 1, 2, 3, 4, 5)

You can try some other combinations of these data types for conversions or type castings.

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