Word Challenge of Doom

#Christian Grey November of doom also Erek has caused me to loose my mind

import zipfile
from xml.etree import ElementTree as ETree
import time

#As always
def preamble():
    import random
    while random.randint(1,10) >= 4:
        print("Python bad")

def file_into_list(filepath, seperator):
    handle = open(filepath, "r") #It's a file handle
    return list(handle.readline().split(seperator)) #Only the first line of the file cause reasons

def mean_of(list):
    _sum = 0 #Underscore since there's already a function called sum T.T
    for nu in list:
        _sum += nu #Add up all the things
    return _sum / len(list) #Divide it by the number of things

def my_random_file_function(path, replace, replace_with):
    #Erek challenged me to open a word document and replace all instances of something with something
    if not zipfile.is_zipfile(path):
        print("Clown this isn't a word file")
        return
    file = zipfile.ZipFile(path, mode = "a") #Apparently .docx files are actually xml files within zip files; Mode = a for read and write
    try:
        file.namelist().index("word/document.xml") #Make sure this particular file contains the target word document xml
    except:
        print("Clown this isn't a word file")
        return
    parsed = ETree.fromstring(file.read("word/document.xml")) #Parse the XML
    for el in parsed.iter(): #Go through every node in existance
        if isinstance(el, ETree.Element): #Make sure it's an element
            if el.tag == "{http://schemas.openxmlformats.org/wordprocessingml/2006/main}t": #Check the tag name that was mangled by the parser
                el.text = el.text.replace(replace, replace_with) #Replave the text
    file.writestr("word/document.xml", ETree.tostring(parsed)) #Write out the new file
    file.close()

def into_int(val):
    return int(val)

def main():
    while True:
        preamble()
        print("\nMenu of doom:")
        print("1) Mean of a CSV file")
        print("2) Find and replace in a word file")
        print("Anything else exits")

        in2 = input("\n> ")
        if in2 == '1':
            pathname = input("CSV file name to read from. It better be a valid \nCSV file cause we don't actually check\nFilename> ")
            li = list(map(into_int, file_into_list(pathname, ",")))
            print(li)
            print("Mean>", mean_of(li))
        elif in2 == '2':
            pathname = input("Word file to read in. Better be an actual word file cause \nwe don't actually check.\nFilename> ")
            replace = input("Search for> ")
            replace_with = input("Replace with> ")
            my_random_file_function(pathname, replace, replace_with)
        else:
            break;
        time.sleep(1.5)

main()