Python defines type conversion functions to directly convert one data type to another which is useful in day to day and competitive programming. A string is a sequence of characters. Strings are amongst the most popular types in Python. We can create them simply by enclosing characters in quotes.
Example : Creating strings in different ways :
# creating string using ' 'str1 = 'Welcome to the Geeks for Geeks !'print(str1) # creating string using " "str2 = "Welcome Geek !"print(str2) # creating string using ''' '''str3 = '''Welcome again'''print(str3) |
Output :
Welcome to the Geeks for Geeks! Welcome Geek! Welcome again
Changing any data type into a String
There are two ways for changing any data type into a String in Python :
- Using the
str()function - Using the
__str__()function
Method 1 : Using the str() function
Any built-in data type can be converted into its string representation by the str() function. Built-in data type in python include:- int, float, complex, list, tuple, dict etc.
Syntax :
str(built-in data type)
Example :
# a is of type inta = 10print("Type before : ", type(a)) # converting the type from int to stra1 = str(a)print("Type after : ", type(a1)) # b is of type floatb = 10.10print("\nType before : ", type(b)) # converting the type from float to strb1 = str(b)print("Type after : ", type(b1)) # type of c is listc = [1, 2, 3]print("\nType before :", type(c)) # converting the type from list to strc1 = str(c)print("Type after : ", type(c1)) # type of d is tupled = (1, 2, 3)print("\nType before:-", type(d)) # converting the type from tuple to strd1 = str(d)print("Type after:-", type(d1)) |
Output:
Type before : <class 'int'> Type after : <class 'str'> Type before : <class 'float'> Type after : <class 'str'> Type before : <class 'list'> Type after : <class 'str'> Type before : <class 'tuple'> Type after : <class 'str'>
Method 2 : Defining __str__() function for a user defined class to be converted to string representation. For a user defined class to be converted to string representation, __str__() function needs to be defined in it.
Example :
# class additionclass addition: def __init__(self): self.a = 10 self.b = 10 # defining __str__() function def __str__(self): return 'value of a = {} value of b = {}'.format(self.a, self.b) # creating object adad = addition()print(str(ad)) # printing the typeprint(type(str(ad))) |
Output:
value of a =10 value of b =10 <class 'str'>
