Human: Python code to take the longest string in list. Assistant: 
Here is a Python code to take the longest string in list

import string

def longest(list):
    """
    Returns the longest string in a list.
    """
    return max(list, key=len)

# Enter the list
list = ["carnation", "frog", "car"]

# Calling the function
print((longest(list)))

#Example Output
# carnation

#Remember to inspect code for bugs.