<human>:  Give me a Python function to check if the string is string.
<bot>: Here is a Python function to check if a string is string

import math

def is_string(func):
  """
  Check if function is string.

  >>> is_string('hello')
  True
  >>> is_string(lambda x: x)
  False
  """
  return isinstance(func, str)

# Enter the function
func = "hello"

# Calling the function
print((is_string(func)))

#Example Output
# True

#Remember to inspect code for bugs.