How do I convert a string to a number in Python?

To convert a string to a number, there are various ways. Let’s see them one by one.

Convert a string to number using int()

Example

In this example, we will convert a string to a number using the int() method −

# String to be converted
myStr = "200"

# Display the string and it's type
print("String = ",myStr)
print("Type= ", type(myStr))

# Convert the string to integer using int() and display the type
myInt = int(myStr)
print("\nInteger = ", myInt)
print("Type = ", type(myInt))

Output

String =  200
Type=  <class 'str'>

Integer =  200
Type =  <class 'int'>

Convert a string to number using float()

Example

In this example, we will convert a string to a float using the float() method and then float to integer using the int() method −

# String to be converted
myStr = "500"

# Display the string and it's type
print("String = ",myStr)
print("Type= ", type(myStr))

# Convert the string to float
myFloat = float(myStr)
print("\nFloat = ", myFloat)
print("Type = ", type(myFloat))

# Convert the float to int
myInt = int(myFloat)
print("\nInteger = ", myInt)
print("Type = ", type(myInt))

Output

String =  500
Type=  <class 'str'>

Float =  500.0
Type =  <class 'float'>

Integer =  500
Type =  <class 'int'>

Convert a string to number base10 and base8

Example

In this example, we will convert a string to a number using the int() with the base parameter.

# String to be converted
myStr = "500"

# Display the string and it's type
print("String = ",myStr)
print("Type= ", type(myStr))

# Convert the string to int
myInt1 = int(myStr)
print("\nInteger (base10) = ", myInt1)
print("Type = ", type(myInt1))

# Convert the string to int
myInt2 = int(myStr, base=8)
print("\nInteger (base8) = ", myInt2)
print("Type = ", type(myInt2))

Output

String =  500
Type=  <class 'str'>
Integer (base10) =  500
Type =  <class 'int'>

Integer (base8) =  320
Type =  <class 'int'>