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# 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.

Time Complexity: O(1)
Auxiliary Space: O(1)

Code # 1:

## python3

 `# 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

 `# 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

 `# 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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