python - Is there a way to rewrite a list comprehension as a for loop?

You mean to extract a boring old regular for loop from a list-comprehension?

list1=[string1[i:i+int1] for i in range(0, len(string1), int1)]

Becomes:

list1 = list()
for i in range(0, len(string1), int1):
    list1.append(string1[i:i+int1])

This would be useful if you wanted to add exception handling, logging, or more complex functions or behaviors while you iterate over your data.

For instance:

list1 = list()
for i in range(0, len(string1), int1):
    log.info('in loop: i={}'.format(i))
    try:
        data = string1[i:i+int1]
    except:
        log.error('oh no!')
        # maybe do something complex here to get some data anyway?
        data = complex_function(i)
    log.debug('appending to list: data={}'.format(data))
    list1.append(data)

But generally speaking the list-comprehension is a totally legitimate way to write that.