Convert a String to a Float in Python

The simplest code, you can use to parse a string to float in Python.

1	float_value = float("123.456")

If you want to convert “123.456” to int, you can’t use int(“123.456”). First, you have to convert this value to float and then to int.

1 2	float_value = float("123.456") int_value = int(float_value)

If you want to use one line, you can do this.

1	int_value = int(float("123.456"))

It can also be done to negative values. So the following code is valid.

1	int_value = int(float("-123.456"))

Parse a string to float if possible

Sometimes, when you try to convert float to string there might be a value that is not possible to convert, such as text or an empty string. In this situation, you can handle these exceptions in this way.

string_value1 = ''

string_value2 = '123.456'

string_value3 = 'just text'

def convert_to_float(string_value):

try:

return float(string_value)

except:

return False

print(convert_to_float(string_value1))

print(convert_to_float(string_value2))

print(convert_to_float(string_value3))

In this simple example, Python returns float. If it can return float, it returns False.

False
123.456
False

Parse a string to float and set precision

You can set the precision of a converted string.

string_value = '123.556'

def convert_to_float(string_value, precision):

try:

float_value = float(string_value)

return round(float_value, precision)

except:

return False

print(convert_to_float(string_value, 0))

print(convert_to_float(string_value, 1))

print(convert_to_float(string_value, 2))

print(convert_to_float(string_value, 3))

print(convert_to_float(string_value, 6))

output

This function will set the precision, and round the number.

Parse a string to float a thousand separator

If you have data written with a thousand separator, you can use the following code to convert it automatically to int or float.

string_int = '1,000,000'

string_float = '1,000,000.58'

print(int(string_int.replace(',', '')))

print(float(string_int.replace(',', '')))

print(float(string_float.replace(',', '')))

This gives us the following output.

1000000
1000000.0
1000000.58

Parse a string to float with a scientific notation

If you use scientific notation, the float function automatically converts such string to float.

Codeigo

Just programming

Convert a String to a Float in Python

Parse a string to float if possible

Parse a string to float and set precision

Parse a string to float a thousand separator

Parse a string to float with a scientific notation