我正在尝试遍历列表列表中的值，以查看最里面的值是否遵循某些规则：
def getPapers(f, n):
x = f.readlines() #read f to x with \n chars and whitespace
strippedPaper = [line.strip("\n").replace(' ', '') for line in x] #stores formatted ballot
#print(strippedPaper)
print()
#Create list of lists from ballots.
strippedBallot = [item.split(",") for item in strippedPaper]
#print(strippedBallot)
print()
#Information passed to parsePaper
try:
for ballot in strippedBallot:
print(ballot) #Show individual ballots
valueParsePaper = parsePaper(ballot, n) #ballot is passed to parsePaper here.
print(valueParsePaper) #Displays the value returned from parsePaper
except TypeError:
print("There was an error with the data type passed to var 'valueParsePaper'\n"
"from this set.\n")
def parsePaper(s, n):
#If s is informal reutrn an empty list with an appropriate string
try:
if len(s) > n:
tooLong = ([], "too long")
return tooLong
elif len(s) == 0:
blankBallot = ([], "blank")
return blankBallot
#elif sum(s[:]) == 0:
#blankBallot = ([], "blank")
#return blankBallot
else:
voteWorth = parseVote(s)
#The vote inside the ballot is passed to parseVote
#parseVote returns a value to voteWorth.
if voteWorth == 0: #for empty/blank string
return ([], "blank")
elif voteWorth == int(-1): #for non-digits/invalid numbers
return ([], "non-digits")
else: #for valid votes
return ([s], "")
except ValueError:
print("There is an invalid value at parsePaper")
#parseVote(s) Returns vote from s, return 0 for empty vote, -1 for votes containing non-digits
#except spaces
def parseVote(s):
try:
for i in s:
if i == ' ':
return int(0) #for empty spaces, return to parsePaper
elif i == '':
return int(0) #for blanks, return to parsePaper
elif i.isdigit() == False: #for non-digits
return int(-1) #return to parsePaper
elif int(i) < 0: #for negnative numbers
return int(-1) #return to parsePaper
else:
return int(i) #return the positive integer to parsePaper
except ValueError:
print("The object passed to parseVote is invalid.")
这会成对显示输入和输出。
['']
([], 'blank')
['1', '2', '3', '4']
([['1', '2', '3', '4']], '')
['', '23', '']
([], 'blank')
['9', '-8']
([['9', '-8']], '')
['thesepeople!']
([], 'non-digits')
['4', '', '4', '4']
([['4', '', '4', '4']], '')
['5', '5', '', '5', '5']
([['5', '5', '', '5', '5']], '')
前两行很好，它是空白并返回空白，接下来两行出现很好，因为它按原样返回值，但第三对不应该返回（[]，空白），因为输入包含正整数。您还可以看到第4对应返回“非数字”，因为它包含负数。
逐步完成后，我发现该函数只返回每个子列表中的第一个值。
我需要的是是让程序再次通过相同的子列表并在确定子列表是否有效之前检查每个值 - 我不确定如何检查每个子列表值和THEN确定该子列表的全部内容是否有效。
答案 0 :(得分：0)
我认为我找到了解决我自己问题的方法，可能会遇到任何人：
通过检查并将递交给parseVote（）的每个投票附加到新列表中，然后将新列表列表传递回parsePaper（），我已经能够进行所需的调整。
现在，包含文字或负数的选票将自动失效，选票将加起来为零或被视为空白。
def getPapers(f, n):
x = f.readlines() #read f to x with \n chars and whitespace
strippedPaper = [line.strip("\n").replace(' ', '') for line in x] #stores formatted ballot
#print(strippedPaper)
print()
#Create list of lists from ballots.
strippedBallot = [item.split(",") for item in strippedPaper]
#print(strippedBallot)
print()
#Information passed to parsePaper
try:
for ballot in strippedBallot:
print(ballot) #Show individual ballots
valueParsePaper = parsePaper(ballot, n) #Ballot is passed to parsePaper here.
print(valueParsePaper) #print returned value
except TypeError:
print("There was an error with the data type passed to var 'valueParsePaper'\n"
"from this set.\n")
def parsePaper(s, n):
#If s is informal reutrn an empty list with an appropriate string
try:
if len(s) > n:
tooLong = ([], "too long")
return tooLong
elif len(s) == 0:
blankBallot = ([], "blank")
return blankBallot
#elif sum(s[:]) == 0:
#blankBallot = ([], "blank")
#return blankBallot
else:
voteWorth = parseVote(s)
#The vote inside the ballot is passed to parseVote
#parseVote returns a value to voteWorth.
if voteWorth == 0: #for empty/blank string
return ([], "blank")
elif voteWorth == int(-1): #for non-digits/invalid numbers
return ([], "non-digits")
else: #for valid votes
return (voteWorth, "")
except ValueError:
print("There is an invalid value at parsePaper")
#parseVote(s) Returns vote from s, return 0 for empty vote, -1 for votes containing non-digits
#except spaces
def parseVote(s):
try:
voteWorthList = []
for i in s:
if i == ' ':
i = 0
voteWorthList.append(i)
#return int(0) #for empty spaces, return to parsePaper
elif i == '':
i = 0
voteWorthList.append(i)
#return int(0) #for blanks, return to parsePaper
elif i.isdigit() == False: #for non-digits
i = int(-1)
voteWorthList.append(i)
#return int(-1) #return to parsePaper
elif int(i) < 0: #for negnative numbers
i = int(-1)
voteWorthList.append(i)
#return int(-1) #return to parsePaper
else:
i = int(i)
voteWorthList.append(i)
#return int(i) #return the positive integer to parsePaper
print(voteWorthList)
for i in voteWorthList:
if i < 0:
return int(-1)
if sum(voteWorthList) == 0:
return 0
else:
return voteWorthList
except ValueError:
print("The object passed to parseVote is invalid.")
新输出就是这样，显示原始输入，调整后的输入和最终输出：
['']
[0]
([], 'blank')
['1', '2', '3', '4']
[1, 2, 3, 4]
([1, 2, 3, 4], '')
['', '23', '']
[0, 23, 0]
([0, 23, 0], '')
['9', '-8']
[9, -1]
([], 'non-digits')
['thesepeople!']
[-1]
([], 'non-digits')
['4', '', '4', '4']
[4, 0, 4, 4]
([4, 0, 4, 4], '')
['5', '5', '', '5', '5']
[5, 5, 0, 5, 5]
([5, 5, 0, 5, 5], '')
答案 1 :(得分：0)
这是一个较短的版本，如果它会有所帮助。如果我能正确理解你的问题，我希望这会有所帮助。基本上，你可以在一个功能中做所有事情，而不是做3
def getPapers(f, n):
x = f.readlines()
strippedPaper = [line.strip("\n").replace(' ', '') for line in x]
ballot = tuple()
allBlanks = False if [i.strip() for i in strippedPaper if i] else True
if allBlanks:
ballot = ([], "blank")
elif len(strippedPaper) > n:
ballot = ([], "too long")
else:
ballot = (strippedPaper, "")
for i in strippedPaper:
if i.strip() == '':
continue
if not i.isdigit() or int(i) < 0:
ballot = ([], "non-digits")
break
return ballot