README.md

Correct variable names consist only of Latin letters, digits and underscores and they can't start with a digit.

Check if the given string is a correct variable name.

Example

For name = "var_1__Int", the output should be
variableName(name) = true; For name = "qq-q", the output should be
variableName(name) = false; For name = "2w2", the output should be
variableName(name) = false.

Input/Output

• [time limit] 4000ms (py3)

• [input] string name

  Guaranteed constraints:

  1 ≤ name.length ≤ 10.
  

• [output] boolean

  • true if name is a correct variable name, false otherwise.

test_variable_name.py

import unittest
from variable_name import variable_name


class TestVariableName(unittest.TestCase):
    def test_1(self):
        name = 'var_1__Int'
        result = variable_name(name)
        self.assertTrue(result)

    def test_2(self):
        name = 'qq-q'
        result = variable_name(name)
        self.assertFalse(result)

    def test_3(self):
        name = '2w2'
        result = variable_name(name)
        self.assertFalse(result)

    def test_4(self):
        name = ' variable'
        result = variable_name(name)
        self.assertFalse(result)

    def test_5(self):
        name = 'va[riable0'
        result = variable_name(name)
        self.assertFalse(result)

    def test_6(self):
        name = 'variable0'
        result = variable_name(name)
        self.assertTrue(result)

    def test_7(self):
        name = 'a'
        result = variable_name(name)
        self.assertTrue(result)


if __name__ == '__main__':
    unittest.main()

variableName.py

import re


def variable_name(name):
    if name[0].isdigit():
        return False
    if not re.match('^[A-Za-z0-9_]*$', name):
        return True
    return False