Python 模板代码的缩进混淆

Question

I'm getting this error unindent does not match any outer indentation level on the line

if line.find('ubox')>0

I'm not very experienced with python but pressing Shift Tab in my IDE does not fix the problem. This is the template code from one of my assignments so when I copy pasted it must have messed up the indentation. In the text file given, if lines up for but just eyeballing the code I would have thought it was a nested if in the elif.

def parse_dot_ps_file(filepath):
    '''
    Parsing of a dot.ps file that contains result of RNAfold program
    @args:
    filepath: (full or relative) path to the dot.ps.
    @return:
    dot_ps_result: list f lists with i, j, freq_i_j
    '''
    dot_ps_result = []
    with open(filepath, 'r') as f:
        is_data = False
        for line in f:
            if not is_data and line.startswith('%start of base pair probability data'):
                is_data = True
                continue
            elif is_data and line.startswith('showpage'):
                break
            elif is_data:
        if line.find('ubox') > 0:
                    # take only first 3 numbers
                    data_line = line.split()[:3]
                    dot_ps_result.append(
                        [int(data_line[0]), int(data_line[1]), float(data_line[2])]
                    )
    return dot_ps_result

Answer 1

The interpreter expects something to be found under elif is_data: , but instead it found nothing. So either fill it with your code, or if you meant the line if line.find('ubox') > 0: to execute if the elif is_data: condition executes then fix your indentation.

Answer 2

if line.find('ubox') > 0:
# take only first 3 numbers
    #these two lines below are the problem 
    data_line = line.split()[:3]
    dot_ps_result.append([int(data_line[0]), int(data_line[1]), float(data_line[2])])

You also have an else statement with no code beneath it, so the indentation is hanging, what do you want the script to do there? All you need is pass and that would be fine

You have put too many tabs in this section.

Hope that helps