所以这是我的代码，当我把所有东西设置为'打印'的东西时，代码都有效，但是现在有'返回'，程序在我选择主题，主题和问题/答案后终止。我制作了这个程序，输入我的闪存卡问题和答案，然后能够选择主题，然后选择一个主题，然后选择是否只查看问题，答案或同时查看两者。我注意到在每个列表的末尾都会出现'None'这个词，我试图通过将'print'替换为'return'来解决这个问题，但这会带来更多的问题，我真的很感激我的一些输入应该这样做。
代码低于
- 伊桑，13岁
import sys
subjects = ["History", "Science"]
topics_science = ["Light", "X-mas Exam Review"]
topics_history = ["Italian Renaissance"]
science_xmasreview = ["Q. What do we use to catogorize a habitat?", \
"A. Damp or Dry, Hot or Cold, Windy or Calm, Dim or Bright.", \
"Q. What is something that only eats plants?", \
"A. Herbivore", \
"Q. What are the properties of oxygen?"]
science_light = [
"Q. What is an object the gives out light?", \
"A. Light source", \
"Q. What is the speed of light?", \
"A. 300 million meters per second.", \
"Q. What does transparent mean?", \
"A. Light can pass completely through a transparent material."]
history_renaissance = [
"Q. What did Lorenzo do differently from Cosimo?", \
"A. Lorenzo made no effort to conceal his power", \
"Q. Why did the Pope want Lorenzo dead?", \
"A. Because the Pope wanted more power and saw Lorenzo as a threat.", \
"Q. Who did the Pazzi plot with to kill Lorenzo?", \
"A. Pope Sixtus IV"]
def qanda(x):
print
print "Enter 1 for just questions"
print "Enter 2 for just answers"
print "Enter 3 for both"
qa = raw_input("Enter number: ")
qa = str(qa)
if qa == '1':
printer(x[::2])
elif qa == '2':
printer(x[1::2])
elif qa == '3':
printer(x)
else:
print "Not recognized"
def newline():
raw_input()
print
def printer(list):
n = 0
l = len(list)
print
while n < l:
return list[n]
newline()
n += 1
while n == l:
n += 1
def subjectchoice():
if subject == "1":
print
history()
elif subject == "2":
print
science()
else:
print 'Not recognized.'
def science():
print topics_science
print "Enter 1 for Light"
print "Enter 2 for X-mas Exam Review"
topicchoice = raw_input("Enter number: ")
topicchoice = str(topicchoice)
if topicchoice == "1":
qanda(science_light)
elif topicchoice == "2":
qanda(science_xmasreview)
else:
print "Not recognized"
sys.exit
def history():
print topics_history
print "Enter 1 for Italian Renaissance"
topicchoice = raw_input("Enter number: ")
topicchoice = str(topicchoice)
if topicchoice == "1":
return qanda(history_renaissance)
else:
print "Not recognized"
sys.exit()
print subjects
print "Enter 1 for History"
print "Enter 2 for Science"
subject = raw_input("Enter number: ")
subject = str(subject)
subjectchoice()
答案 0 :(得分：0)
我相信这会有效，你在printer（）函数中不需要return语句：
import sys
subjects = ["History", "Science"]
topics_science = ["Light", "X-mas Exam Review"]
topics_history = ["Italian Renaissance"]
science_xmasreview = ["Q. What do we use to catogorize a habitat?",
"A. Damp or Dry, Hot or Cold, Windy or Calm, Dim or Bright.",
"Q. What is something that only eats plants?",
"A. Herbivore",
"Q. What are the properties of oxygen?"]
science_light = [
"Q. What is an object the gives out light?",
"A. Light source",
"Q. What is the speed of light?",
"A. 300 million meters per second.",
"Q. What does transparent mean?",
"A. Light can pass completely through a transparent material."]
history_renaissance = [
"Q. What did Lorenzo do differently from Cosimo?",
"A. Lorenzo made no effort to conceal his power",
"Q. Why did the Pope want Lorenzo dead?",
"A. Because the Pope wanted more power and saw Lorenzo as a threat.",
"Q. Who did the Pazzi plot with to kill Lorenzo?",
"A. Pope Sixtus IV"]
def printer(list):
n = 0
l = len(list)
print
while n < l:
print list[n] # <-- Changed this from a return to a print statement
newline()
n += 1
while n == l:
n += 1
def qanda(x):
print
print "Enter 1 for just questions"
print "Enter 2 for just answers"
print "Enter 3 for both"
qa = raw_input("Enter number: ")
qa = str(qa)
if qa == '1':
printer(x[::2])
elif qa == '2':
printer(x[1::2])
elif qa == '3':
printer(x)
else:
print "Not recognized"
def newline():
raw_input()
print
def subjectchoice():
if subject == "1":
print
history()
elif subject == "2":
print
science()
else:
print 'Not recognized.'
def science():
print topics_science
print "Enter 1 for Light"
print "Enter 2 for X-mas Exam Review"
topicchoice = raw_input("Enter number: ")
topicchoice = str(topicchoice)
if topicchoice == "1":
qanda(science_light)
elif topicchoice == "2":
qanda(science_xmasreview)
else:
print "Not recognized"
sys.exit
def history():
print topics_history
print "Enter 1 for Italian Renaissance"
topicchoice = raw_input("Enter number: ")
topicchoice = str(topicchoice)
if topicchoice == "1":
return qanda(history_renaissance)
else:
print "Not recognized"
sys.exit()
print subjects
print "Enter 1 for History"
print "Enter 2 for Science"
subject = raw_input("Enter number: ")
subject = str(subject)
subjectchoice()