IDLE Python3.4.3の使用。これは、ユーザーに小さなクイズを出して、正解した数を計算するスクリプトです。スクリプトを実行する前に、コメントに無効な構文エラーがあります。これがコメントの周りのコード全体です。特定のコメントは次の行の下にありますscore = decimal.Decimal(score)
:
score = amountright/7*100 """this takes the amount of questions the user got right, divides it by 7 (the total number of questions), then multiplies it by 100 to get a percentage correct and stores it in the variable score"""
import decimal """this will import a function to round off the final percentage to a whole number instead of an unnecessarily long decimal"""
score = decimal.Decimal(score)
"""this redefines the score variable as some sort of roundable decimal. the round() function in the line below will still function without this line, but it would print an unneeded .0 before the %"""
print ("You got " + str(amountright) + " out of 7 right, or " + str(round(score,0)) + "%.")
"""the round() function works by rounding the first argument to n places in the second argument"""
これを実行すると、無効な構文エラーが発生し、score
赤の単語でsとcが強調表示されます。'を使用しても、これに違いはありません。ただし、次のようなコードを実行すると、次のようになります。
"""
This redefines the score variable as some sort of roundable decimal. the round() function in the line
below will still function without this line, but it would print an unneeded .0 before the %
"""
それでも構文エラーが発生しますが、今回はsをscore
赤で強調表示するだけです。unutbuのリクエストにより追加されたrepr:
print ("Here is a quiz!\n") #starting prompt
useranswer = input("Question 1: What is 4+|6x1|? ")
#this is where the user enters their answer to the question
#the following 2 variables on lines 7 and 9 only need to be defined once
rightanswerresult = "Correct! Next question:\n" #tells the user they are correct
invalidanswerresult = "This is not a number. This is counted as a wrong answer.\n"
"""if the user does not answer with a number, this string will print telling them so and the question will
be counted wrong"""
amountright = 0 #this number increases every time the user answers a question correctly
if useranswer.isdigit(): #if the user's answer is a number, the code below runs
if useranswer == "10":
#this checks if the user's answer and the correct answer are the same, then runs the code below if they are"""
print (rightanswerresult) #this prints the variable rightanswerresult described on line 7
amountright += 1 #this will add the value one to the variable amountright described on line 13
else: #if the user's answer and the correct answer are not the same, the code below runs
print ("Wrong, it was 10. Next question:\n") #tells the user they were wrong
else: #if the user's answer is NOT a number, this runs
print (invalidanswerresult) #this prints the varible invalidanswerresult described in line 9
#this pattern is repeated 5 more times. an altered process is used for the True/False question (#7)
useranswer = input("Question 2: What is (15/3) x 12? ")
if useranswer.isdigit():
if useranswer == "60":
print (rightanswerresult)
amountright += 1
else:
print ("Wrong, it was 60. Next question:\n")
else:
print (invalidanswerresult)
useranswer = input("Question 3: What is 20+24/12? ")
if useranswer.isdigit():
if useranswer == "22":
print (rightanswerresult)
amountright += 1
else:
print ("Wrong, it was 22. Next question:\n")
else:
print (invalidanswerresult)
useranswer = input("Question 4: Solve for x: 2x-1=5 ")
if useranswer.isdigit():
if useranswer == "3":
print (rightanswerresult)
amountright += 1
else:
print ("Wrong, it was 3. Next question:\n")
else:
print (invalidanswerresult)
useranswer = input("Question 5: What is the square root of 256? ")
if useranswer.isdigit():
if useranswer == "16":
print (rightanswerresult)
amountright += 1
else:
print ("Wrong, it was 16. Next question:\n")
else:
print (invalidanswerresult)
useranswer = input("Question 6: What is 7x7+7/7-7? ")
if useranswer.isdigit():
if useranswer == "1":
print (rightanswerresult)
amountright += 1
else:
print ("Wrong, it was 1. Next question:\n")
else:
print (invalidanswerresult)
#the question below appears different because it is True/False and the last question
useranswer = input("Question 7: True or False: |3|=98/2 ").lower() #as before, the user is asked a question
if useranswer == "false": #checks if user's answer is false, and runs code below if it is
print ("You're right! Your results are below:\n") #this tells the user they are correct then shows them their final score
amountright += 1 #as before, this will add the value one to the variable amountright described on line 8
if useranswer == "true": #checks if user's answer is true, and runs code below if it is
print ("Actually, its false. Your results are below:\n") #this tells the user they are wrong then shows them their final score
elif useranswer != "false" and useranswer != "true": #if the user's answer is not true or false, this code runs
print ("It seem you didn't enter true or false. Maybe you made a spelling error? Anyways, your results are below:\n")
"""tells user their answer is invalid then shows final score"""
#all questions have been completed. below is the final score calculation
score = amountright/7*100 """this takes the amount of questions the user got right, divides it by 7
(the total number of questions), then multiplies it by 100 to get a percentage correct and stores
it in the variable score"""
import decimal """this will import a function to round off the final percentage to a whole number
instead of an unnecessarily long decimal"""
score = decimal.Decimal(score)
"""this redefines the score variable as some sort of roundable decimal. the round() function in the line
below will still function without this line, but it would print an unneeded .0 before the %"""
print ("You got " + str(amountright) + " out of 7 right, or " + str(round(score,0)) + "%.")
"""the round() function works by rounding the first argument to n places in the second argument"""
コメントに誤りはありますか?
#
コメントの開始を示すために使用されます。三重引用符は、複数行の文字列の開始と終了を示すために使用されます。文字列はコメントではありませんが、複数行の文字列を複数行のコメントとして使用できる場合があります。
ただし、文字列の配置は、Pythonの構文規則に従う必要があります。
score = amountright/7*100 """this takes the amount..."""
文字列が文字列ではない式の後に続くため、SyntaxErrorが発生します。amountright/7*100 """this takes the amount..."""
とほぼ同等です
>>> 1 "foo"
SyntaxError: invalid syntax
Pythonは、数字の後に文字列が続くことを評価する方法を知りません。評価できたとしても、値はに割り当てられscore
ます。複数行の文字列はコメントとして解釈されません。複数行の文字列がコメントとして機能するには、それ自体が1行にある必要があります。
score = amountright/7*100
"""this takes the amount of questions the user got right, divides it by 7
(the total number of questions), then multiplies it by 100 to get a percentage correct and stores it in the variable score"""
import decimal
"""this will import a function to round off the final percentage to a whole number
instead of an unnecessarily long decimal"""
または、より一般的に使用されるコメント構文を使用します。
score = amountright/7*100
# this takes the amount of questions the user got right, divides it by 7 (the
# total number of questions), then multiplies it by 100 to get a percentage
# correct and stores it in the variable score
#
すべての行の前にを置くのは面倒に思えるかもしれませんが、Pythonでプログラミングするための優れたテキストエディタには、テキストの領域を選択し、ボタンまたはキーの組み合わせを押して#
記号を挿入する方法が必要です。エディターにこの機能がない場合は、ある機能を見つけてください。
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