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我不明白为什么第104行总是返回无效语法，有人能告诉我正确的方向吗？这跟我用伊莱夫的方式有关吗？抱歉，如果这是一个新手问题！在

第104行是中for项中的else语句工作dict.keys()printGrammar中的循环import sys

import string

from collections import defaultdict

#default length of 3

stringLength = 3

#get last argument of command line(file)

if len(sys.argv) == 1:

#get a length from user

try:

stringLength = int(input('Length? '))

filename = input('Filename: ')

except ValueError:

print("Not a number")

elif len(sys.argv) == 2:

#get a length from user

try:

stringLength = int(input('Length? '))

filename = sys.argv[1]

except ValueError:

print("Not a number")

elif len(sys.argv) == 3:

filename = sys.argv[2]

stringLength = sys.argv[1].split('l')[1]

else:

print("Invalid input!")

#get start symbol

with open(filename, "r") as grammar:

#read file

lines = grammar.readlines()

start = lines[0].split('=')[0]

start = start.replace(" ", "")

#checks

#print(stringLength)

#print(filename)

#print(start)

def str2dict(filename):

result = defaultdict(list)

with open(filename, "r") as grammar:

#read file

lines = grammar.readlines()

count = 0

#loop through

for line in lines:

#append info

line = line.rstrip()

result[line[0]].append(line.split('=')[1])

return result

workingDict = str2dict("Binary.txt")

print(workingDict)

def printGrammar(result):

sentenceList = []

workList = []

workList.append(start)

i = 0

firstNT = ""

#While the worklist is not empty:

while(len(workList) != 0):

#Get and delete one potential sentence s from the worklist.

symbol = workList.pop()

#If the | s | > N, continue.

if len(str(symbol).replace(" ", "")) > int(stringLength):

continue

else:

if str(symbol) in workingDict.keys():

#append the right derivation

for item in workingDict.get(symbol):

workList.append(list(item.replace(" ", "")))

#workList.append(str(workingDict.get(symbol)))

#add derivation

print(workingDict.keys())

#If s has no nonterminals, print s and continue.

for item in workingDict.keys():

print("test")

print(''.join(item))

if len(item) != 1:

continue

#if the element is in dictionary, dont print

elif ''.join(item) in workingDict.keys():

continue

print(symbol)

#if element is not in dictionary, print

else:

print("THIS IS A TERMINAL!!")

print(item)

#Choose the leftmost nonterminal NT.

print(workList)

#For all productions NT -> rhs:

#Replace NT in s with rhs; call it tmp.

#Store tmp on worklist.

return workList

print (printGrammar(workingDict))