python 评论中的语法无效
python invalid syntax in comment
使用空闲 Python 3.4.3。这是一个脚本，给用户一个小测验，然后计算有多少人答对了。我的脚本 运行s 之前的注释中存在无效语法错误。这是评论周围的整个代码。具体注释在score = decimal.Decimal(score):
行下
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"""
我运行这个，得到了无效的语法错误，然后它高亮了单词score中的s和c红色。使用 ' 在这方面没有区别。但是，当我 运行 这样的代码时：
"""
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 %
"""
还是报语法错误，不过这次只是把score中的s高亮红色。
由 unutbu 的请求添加的 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"""
评论有误吗？
#用来表示一个comment. Triple quotes are used to indicate the start and end of multiline strings. Although strings are not comments, sometimes multiline strings can be used as multiline comments的开始。
不过字符串的摆放还是要遵守Python syntax rules.
score = amountright/7*100 """this takes the amount..."""
引发 SyntaxError，因为字符串后面的表达式不是字符串。 amountright/7*100 """this takes the amount...""" 大致相当于
>>> 1 "foo"
SyntaxError: invalid syntax
Python 不知道如何计算后跟字符串的数字。即使可以计算，该值也会是assigned to score。多行字符串不会被解释为注释。对于充当注释的多行字符串，它必须单独占一行：
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"""
或者，使用更常用的注释语法：
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
在每一行前面加上一个 # 可能看起来很痛苦，但这是一个很好的文本
Python 中的编程编辑器应该可以让您 select 文本区域和
按一个按钮或组合键为您插入 # 符号。如果你的
编辑器没有这个功能，找一个
.
我遇到了类似的问题：
有时 IDLE 将您指向错误的方向并在错误位置出现错误字符时说 "invalid syntax"，例如
print(f"value of counter = {counter}")
假设第 50 行运行良好，但是
print(f"value of counter = {counter]}")
生成消息 "invalid syntax" 指向第 1 行中的不相关评论
我花了一些时间才在格式化字符串中找到拼写错误“]”。
所以一定要检查你的牙套！
使用空闲 Python 3.4.3。这是一个脚本，给用户一个小测验，然后计算有多少人答对了。我的脚本 运行s 之前的注释中存在无效语法错误。这是评论周围的整个代码。具体注释在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"""
我运行这个，得到了无效的语法错误，然后它高亮了单词score中的s和c红色。使用 ' 在这方面没有区别。但是，当我 运行 这样的代码时：
"""
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 %
"""
还是报语法错误，不过这次只是把score中的s高亮红色。
由 unutbu 的请求添加的 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"""
评论有误吗？
#用来表示一个comment. Triple quotes are used to indicate the start and end of multiline strings. Although strings are not comments, sometimes multiline strings can be used as multiline comments的开始。
不过字符串的摆放还是要遵守Python syntax rules.
score = amountright/7*100 """this takes the amount..."""
引发 SyntaxError，因为字符串后面的表达式不是字符串。 amountright/7*100 """this takes the amount...""" 大致相当于
>>> 1 "foo"
SyntaxError: invalid syntax
Python 不知道如何计算后跟字符串的数字。即使可以计算，该值也会是assigned to score。多行字符串不会被解释为注释。对于充当注释的多行字符串，它必须单独占一行：
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"""
或者，使用更常用的注释语法：
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
在每一行前面加上一个 # 可能看起来很痛苦，但这是一个很好的文本
Python 中的编程编辑器应该可以让您 select 文本区域和
按一个按钮或组合键为您插入 # 符号。如果你的
编辑器没有这个功能，找一个
.
我遇到了类似的问题： 有时 IDLE 将您指向错误的方向并在错误位置出现错误字符时说 "invalid syntax"，例如
print(f"value of counter = {counter}")
假设第 50 行运行良好，但是
print(f"value of counter = {counter]}")
生成消息 "invalid syntax" 指向第 1 行中的不相关评论
我花了一些时间才在格式化字符串中找到拼写错误“]”。 所以一定要检查你的牙套！