# Python math library | exp() method

Python has math library and has many functions regarding it. One such function is exp(). This method is used to calculate the power of e i.e. e^y or we can say exponential of y. The value of e is approximately equal to 2.71828…..

Syntax : math.exp(y)

Parameters :
y [Required] – It is any valid python number either positive or negative.
Note that if y has value other than number then its return error.

Returns: Returns floating point number by calculating e^y.

Code # 1:

 `# Python3 code to demonstrate  ` `# the working of exp()  ` `import` `math  ` ` `  `# initializing the value  ` `test_int ``=` `4` `test_neg_int ``=` `-``3` `test_float ``=` `0.00` ` `  `# checking exp() values  ` `# with different numbers ` `print` `(math.exp(test_int)) ` `print` `(math.exp(test_neg_int)) ` `print` `(math.exp(test_float)) `

Output:

```54.598150033144236
0.049787068367863944
1.0
```

Code #2:

 `# Python3 code to demonstrate  ` `# the working of exp()  ` `import` `math  ` ` `  `# checking exp() values  ` `# with inbuilt numbers ` `print` `(math.exp(math.pi)) ` `print` `(math.exp(math.e)) `

Output:

```23.140692632779267
15.154262241479262
```

Code #3: TypeError

 `# Python3 code to demonstrate  ` `# the working of exp()  ` `import` `math  ` ` `  `# checking for string ` `print` `(math.exp(``"25"``)) `

Output:

```Traceback (most recent call last):
File "/home/c7ae4f1bef0ed8c7756b3f55e7d2ce81.py", line 6, in
print (math.exp("25"))
TypeError: a float is required
```

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