escape special chars python

import os, datetime as dt
ADD_BENCHMARK_TO_LOG_FILE = True
def GetMessageContent():
    result = ''
    with open("message.txt") as file:
        result = file.read()
    return result

map = {
        '\\' : "\\\\", '`' : "\\`",
        '*' : "\\*", '_' : "\\_"
}
content = GetMessageContent()
t1 = dt.datetime.now()
result = []

for c in content:
    dictResult = map.get(c, None)
    if dictResult != None:
        result.append(dictResult)
    else:
        result.append(c)

resultStr = ''.join(result)
t2 = dt.datetime.now()
print(f'That took {(t2 - t1).microseconds * 1000} nanoseconds.\n')

if ADD_BENCHMARK_TO_LOG_FILE:
    with open("log.txt", "a") as file:
        file.write(f'Python: {(t2 - t1).microseconds * 1000} nanoseconds.\n')

if input("See resulting text? Y or N?\n").upper() == 'Y':
    print(resultStr)