Convert Strings to Numbers and Numbers to Strings in Python

In Python, strings or numbers can be converted to a number of strings using various inbuilt functions like str(), int(), float(), etc. Let’s see how to use each of them. 

Example 1: Converting a Python String to an int:

Python3

# code
# gfg contains string 10
gfg = "10"

# using the int(), string is auto converted to int
print(int(gfg)+20)

Output

30

Example 2: Converting a Python String to float:

Python3

# code
gfg = "10"

# float(gfg) gives 10.0
print(float(gfg)+2.0)

Output

12.0

Example 3: Converting a Python int to a String:

This is achieved by using str() function as shown below

Python3

# code
gfg = 100

# str(gfg) gives '100'
print(str(gfg)+" is a 3 digit number")

# concatenation is performed between them
print(str(gfg)+"200")

Output

100 is a 3 digit number
100200

Example 4: Converting a Python float to a String

This is achieved by using str() function as shown below

Python3

# code
gfg = 20.0

# str(gfg) becomes '20.0'
print(str(gfg)+"is now a string")

# no addition is performed. concatenated output
print(str(gfg)+"30.0")

Output

20.0is now a string
20.030.0

Example 5: Converting python int to string using format() function 

Python3

# python program to convert integer number
# to string using format() function
intnum = 20
print("string is {} ".format(intnum))
print(type("string is {} ".format(intnum)))

Output

string is 20 
<class 'str'>

Example 5: Converting python float to string using format() function 

Python3

# python program to convert float integer number
# to string using format() function
floatnum = 20.00
print("string is {} ".format(floatnum))
print(type("string is {} ".format(floatnum)))

Output

string is 20.0 
<class 'str'>

Example 6: Converting python string to int using eval() function 

Python3

# converting python string to
# int using eval() function
a = "100"
print(eval(a)+12)

Output

112

Example 7: Converting python string to float using eval() function  

Python3

# converting python string to
# float using eval() function
a = "100.00"
print(eval(a)+12)

Output

112.0