Question

我正在学习python，并且正在尝试一组练习，但是我被困在下一个练习中：

     inp_1 = input('your score between 0.0 and 1.0')

        try:   
score = float(inp_1)   
if 0.9 <= score <= 1.0:
              print ("A")    elif score >= 0.8:
              print ("B")    elif score >= 0.7:
              print ("C")    elif score >= 0.6:
              print ("D")    elif score <  0.6:
              print ("Your grade is an F")    
    else:       
print ('your score is more than 1.0')  
    except:   
 print ('invalid input, please try with a number')

但是我收到下一条消息错误：

IndentationError: unindent does not match any outer indentation level on line 7 elif score >= 0.8: ^ in main.py

Answer 1

缩进（=每行前面的制表符/空格数）在python中很重要。您发布的代码缩进不正确。正确的缩进应如下所示：

inp_1 = input('your score between 0.0 and 1.0')

try:   
    score = float(inp_1)   
    if 0.9 <= score <= 1.0:
        print ("A")    
    elif score >= 0.8:
        print ("B")
    elif score >= 0.7:
        print ("C")
    elif score >= 0.6:
        print ("D")    
    elif score <  0.6:
        print ("Your grade is an F")    
    else:       
        print ('your score is more than 1.0')  
except:   
    print ('invalid input, please try with a number')

第一行始终不缩进。当开始一个块时（例如try:，if:，elif:，...），属于该块的所有后续行都比开始行缩进4个空格。通过写缩进较少的下一条语句来“关闭”一个块。

另一个例子：

if False:
    print(1)
    print(2)
# prints nothing because both print statements are part of the if condition

if False:
    print(1)
print(2)
# prints 2 because the `print(2)` statement is not part of the if condition

这能回答您的问题吗？

Answer 2

您的缩进应该是这样的：

inp_1 = input('your score between 0.0 and 1.0')
try:
    score = float(inp_1)
    if 0.9 <= score <= 1.0:
        print ("A")    
    elif score >= 0.8:
        print ("B")    
    elif score >= 0.7:
        print ("C")    
    elif score >= 0.6:
        print ("D")    
    elif score <  0.6:
        print ("Your grade is an F")
    else:
        print ('your score is more than 1.0')
except:
    print ('invalid input, please try with a number')

我认为您不太了解缩进。这不同于其他任何语言。您需要正确进行缩进。

希望对您有帮助

python初学者语法语句if-elif

2 个答案: