<human>:  check if variable exists in locals.
<bot>: Here is a Python code to check if a variable exists in locals

import math

def check_var(var):
  """Check if variable exists in locals."""
  if var in locals():
    return True
  else:
    return False

# Enter the variable
var = 'a'

# Calling the function
print((check_var(var)))

#Example Output
# False

#Remember to inspect code for bugs.