0

所以这是我的代码，当我将所有内容都设置为“打印”时，代码可以工作，但现在“返回”在我选择主题、主题和问题/答案后程序终止。我做了这个程序来输入我的闪存卡问题和答案，然后可以选择主题，然后选择一个主题，然后选择是只看问题、答案还是两者都看。我注意到在每个列表的末尾都会出现“无”这个词，我试图通过用“返回”替换“打印”来解决这个问题，但这带来了更多问题，我真的很感激一些关于我的意见应该做。

代码如下

——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()
4

1 回答 1

0

我相信这会起作用，您不需要在您的打印机（）函数中返回语句：

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()
于 2013-03-17T20:15:25.117 回答