JavaScript provides a built-in parseInt method.

It can be used like this:

- `parseInt("10")` returns `10`
- `parseInt("10 apples")` also returns `10`

We would like it to return `"NaN"` (as a string) for the second case because the input string is not a valid number.

You are asked to write a `myParseInt` method with the following rules:

- It should make the conversion if the given string only contains a single integer value (and possibly spaces - including tabs, line feeds... - at both ends)
- For all other strings (including the ones representing float values), it should return NaN
- It should assume that all numbers are not signed and written in base 10

Difficulty: EASY
Starter code: def my_parse_int(string):
	

Solutions:
def my_parse_int(s):
	try:
		return int(s)
	except ValueError:
		return 'NaN'


def my_parse_int(string):
	try:
		return int(string)
	except ValueError:
		return 'NaN'


def my_parse_int(s):
	return int(s) if s.strip().isdigit() else 'NaN'


def my_parse_int(stg):
	try:
		return int(stg)
	except ValueError:
		return 'NaN'


def my_parse_int(str):
	try:
		return int(str)
	except:
		return 'NaN'


def my_parse_int(num_str):
	try:
		return int(num_str.strip())
	except:
		return 'NaN'


import re

def my_parse_int(string):
	return int(''.join([x for x in string if x.isdigit()])) if re.match('\\s*\\d+\\s*$', string) else 'NaN'