Comprehension lists allow you to create a new list of iterable objects. Basically, they contain the expression that must be executed for each element inside the loop that iterates over each element.

The basic syntax is:

new_list = [expression for_loop_one_or_more conditions]

List comprehensions can also be used to iterate over strings:

>>> protocolList = ["FTP", "HTTP", "SNMP", "SSH"]
>>> protocolList_lower= [protocol.lower() for protocol in protocolList]
>>> print(protocolList_lower) # Output: ['ftp', 'http', 'snmp', 'ssh']