在我的程序中发现时间和内存效率低下

Question

我需要在该程序中查找时间和内存效率低下的地方。 我已经尝试了几件事：更改变量名称，还更改了代码以删除for循环。 这些事情使程序无法正常运行。 有人可以帮忙吗？

import sys
def longest(doc):

infile = open(doc, "r")
text = infile.read()

longest_seq = []
current_seq = []
current_start = ""
first_letters = [""]
for word in text.split():
    current_start = word[0]
    if current_start == first_letters[-1]:
        # same first letter as previous word
        current_seq.append(word)
    elif current_start != first_letters[-1]:
        # done with the current sequence
        current_seq = [word]

    first_letters.append(word[0])

    if len(longest_seq) < len(current_seq):
        longest_seq = current_seq

infile.close()
return longest_seq


def main(argv):
    if len(argv) != 2:
    print("Usage: {} File".format(argv[0]), file=sys.stderr)
    exit(-1)

   seq = longest(argv[1])
   slength = len(longest(argv[1]))

print("longest sequence of consecutive words starting with the same letter:")
print("\'{}\'".format(' '.join(seq)))
print("length: {}\n".format(slength))



if __name__ == "__main__":
main(sys.argv)