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# float() in Python

• Difficulty Level : Easy
• Last Updated : 17 Nov, 2017

The float() method is used to return a floating point number from a number or a string.
Syntax:

`float(x)`

The method only accepts one parameter and that is also optional to use. Let us look at the various types of argument, the method accepts:

1. A number : Can be an Integer or a floating point number.
2. A String :
• Must contain numbers of any type.
• Any left or right whitespaces or a new line is ignored by the method.
• Mathematical Operators can be used.
• Can contain NaN, Infinity or inf (any cases)

Values that the float() method can return depending upon the argument passed

• If an argument is passed, then the equivalent floating point number is returned.
• If no argument is passed then the method returns 0.0 .
• If any string is passed that is not a decimal point number or does not match to any cases mentioned above then an error will be raised.
• If a number is passed outside the range of Python float then OverflowError is generated.

Now let us look at various examples and the working of float() method.

 `# Python program to illustrate``# Various examples and working of float()``# for integers``print``(``float``(``21.89``))`` ` `# for floating point numbers``print``(``float``(``8``))`` ` `# for integer type strings``print``(``float``(``"23"``))`` ` `# for floating type strings``print``(``float``(``"-16.54"``))`` ` `# for string floats with whitespaces``print``(``float``(``"     -24.45   \n"``))`` ` `# for inf/infinity``print``(``float``(``"InF"``))``print``(``float``(``"InFiNiTy"``))`` ` `# for NaN``print``(``float``(``"nan"``))``print``(``float``(``"NaN"``))`` ` `# Error is generated at last``print``(``float``(``"Geeks"``))`

Output:

```21.89
8.0
23.0
-16.54
-24.45
inf
inf
nan
nan
```

All lines are executed properly but the last one which will return an error:

```Traceback (most recent call last):
File "/home/21499f1e9ca207f0052f13d64cb6be31.py", line 25, in
print(float("Geeks"))
ValueError: could not convert string to float: 'Geeks'```

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