Question

由于某种原因，我无法测试我的功能。我收到了这个错误。

 print(write_avg(out_file('grades.csv')))
 Traceback (most recent call last):
 Python Shell, prompt 3, line 1
builtins.NameError: name 'out_file' is not defined

任何人都可以帮我解决这个问题吗？这是我的功能。

 def write_avg(L, out_file):
  '''(list, file) -> NoneType
  Given a list of lists where each inner list consists of a string and a 
  float,and an open file for writing, write the contents of each inner list 
  as a line in the file. Each line of the file should be the string followed 
  by the float separated by a comma. Close the file when done.
  '''

for line in out_file:
    L.append(',')
    output_line = L
    out_file.write(output_line)
out_file.close()

Answer 1

def write_avg(L, out_file):


'''(list, file) -> NoneType
    Given a list of lists where each inner list consists of a string and a 
    float,and an open file for writing, write the contents of each inner list 
    as a line in the file. Each line of the file should be the string followed 
    by the float separated by a comma. Close the file when done.
    '''
    open_out_file = open(out_file, 'w')
    for y in L: # iterate over list
        result = y[0]+','+str(y[1]) + '\n'
        open_out_file.write(result) #format needed
        return result
    open_out_file.close()

gradeL = [['S',34],['A',34],['N',34],['L',34]]
write_avg(gradeL,'grades.csv')

Output in file:
S,34
A,34
N,34
L,34

将str和float写入文件

1 个答案: