如何修復我的報告功能？

Question

我加載庫工作得很好，我的報告的作者在Python計算工作，但是當我把它上傳到一個自動評價它說

=ERROR: File report.txt contains 0 lines, but shall contain 1 lines.

def load_library(f): 

    with open(f,'rt') as x: 
     return dict(map(str.strip, line.split("|")) for line in x) 

def count_authors(file_name): 
     invert = {} 
     for k, v in load_library(file_name).items(): 
      invert[v] = invert.get(v, 0) + 1 
     return invert 


def write_authors_counts(counts, file_name): 
     with open(file_name, 'w') as fobj: 
      for name, count in counts.items(): 
       fobj.write('{}: {}\n'.format(name, count)) 


def report_author_counts(lib_fpath, rep_filepath): 
     counts = count_authors(lib_fpath) 
     write_authors_counts(counts, rep_filepath) 

報告作者計數

In module library.py, create function report_author_counts(lib_fpath, rep_filepath) which shall compute the number of books of each author and the total number of books, and shall store this information in another text file. 

    Inputs: 
    Path to a library text file (containing records for individual books). 
    Path to report text file that shall be created by this function. 
    Outputs: None 
    Assuming the file books.txt has the same contents as above, running the function like this: 

    >>> report_author_counts('books.txt', 'report.txt') 
    shall create a new text file report.txt with the following contents: 

    Clarke, Arthur C.: 2 
    Herbert, Frank: 2 
    Capek, Karel: 1 
    Asimov, Isaac: 3 
    TOTAL BOOKS: 8 
    The order of the lines is irrelevant. Do not forget the TOTAL BOOKS line! If the input file is empty, the output file shall contain just the line TOTAL BOOKS: 0. 

    Suggestion: There are basically 2 ways how to implement this function. You can either 

    use the 2 above functions to load the library, transform it using index_by_author() and then easilly iterate over the dictionary, or 
    you can work directly with the source text file, extract the author names, and count their occurences. 
    Both options are possible, provided the function will accept the specified arguments and will produce the right file contents. The choice is up to you. 

Answer 1

我的猜測是，如果你得到一個空的庫文本，會發生什麼情況的基本情況是失敗的。輸出應該有一行「TOTAL BOOKS：0」，但在代碼中沒有。

更新你的代碼如下：

def write_authors_counts(counts, file_name): 
    tot_books = 0 # new line 
    with open(file_name, 'w') as fobj: 
     for name, count in counts.items(): 
      fobj.write('{}: {}\n'.format(name, count)) 
      tot_books += int(count) # new line 
     fobj.write('TOTAL BOOKS: ' + str(tot_books)) # new line