python-3.x - 有人可以帮我吗。我在用Python编写此代码时遇到问题

Question

我们正在处理一张鲜花 list ，以及有关每一种鲜花的一些信息。 create_file函数将此信息写入CSV文件。 contents_of_file函数将该文件读入记录，并以格式正确的块形式返回信息。使用DictReader填充contents_of_file函数的间隙，以将CSV文件中的数据转换为字典。

import os
import csv

# Create a file with data in it
def create_file(filename):
  with open(filename, "a") as file:
    file.write("name,color,type\n")
    file.write("carnation,pink,annual\n")
    file.write("daffodil,yellow,perennial\n")
    file.write("iris,blue,perennial\n")
    file.write("poinsettia,red,perennial\n")
    file.write("sunflower,yellow,annual\n")

# Read the file contents and format the information about each row
def contents_of_file(filename):
  return_string = ""

  # Call the function to create the file 
  create_file(filename)

  # Open the file
  with open(filename) as file:
    # Read the rows of the file into a dictionary
    f = csv.reader(file)
    # Process each item of the dictionary
    for row in f:
      name, color, type = row
      return_string += "a {} {} is {}\n".format(row["color"], row["name"], row["type"])
  return return_string

#Call the function
print(contents_of_file("flowers.csv"))

[See the error][1]


  [1]: /image/UycSc.jpg

Answer 1

这就是答案，@ Pratik Panda在您使用过reader()的代码中，但是在问题陈述中，他们说必须使用 DictReader()，

import os
import csv

# Create a file with data in it
def create_file(filename):
  with open(filename, "w") as file:
    file.write("name,color,type\n")
    file.write("carnation,pink,annual\n")
    file.write("daffodil,yellow,perennial\n")
    file.write("iris,blue,perennial\n")
    file.write("poinsettia,red,perennial\n")
    file.write("sunflower,yellow,annual\n")

# Read the file contents and format the information about each row
def contents_of_file(filename):
  return_string = ""

  # Call the function to create the file 
  create_file(filename)

  # Open the file
  with open(filename) as file:
    # Read the rows of the file into a dictionary
    f = csv.DictReader(file)
    # Process each item of the dictionary
    for row in f:
      return_string += "a {} {} is {}\n".format(row["color"], row["name"], row["type"])
  return return_string

#Call the function
print(contents_of_file("flowers.csv"))