Python:迭代列表

时间:2013-03-04 06:32:22

标签: list python-2.7 iterator

我收到一个文本文件,其中包含许多行,如下所示......许多随机信息

  

Spiaks Restaurant | 42.74 | -73.70 | 2 Archibald St + Watervliet,NY 12189 | http://www.yelp.com/biz/spiaks-restaurant-watervliet|Italian|4|5|4|3|3|4|4

例如,Spiaks Restaurant位于0位,42.74位于位置1,-73.70位于位置2 ....意大利位于位置5 ... 4 | 5 | 4 | 3 | 3 | 4 | 4是另一个列表...所以基本上是列表中的列表,数字4将位于位置6,5位于位置7 ..等等

我必须询问用户,用户应回复:

What type of restaurant would you like => Italian
What is the minimum rating => 3.6

结果应为:

Name: Spiaks Restaurant; Rating 3.86
Name: Lo Portos; Rating 4.00
Name: Verdiles Restaurant; Rating 4.00
Found 3 restaurants.

这是我的代码:

rest_type = raw_input("What type of restaurant would you like => ")
min_rate = float(raw_input("What is the minimum rating => "))

def parse_line(text_file):
count = 0.0
a_strip = text_file.strip('\n')
b_split = a_strip.split('|')

for i in range(6, len(b_split)):
    b_split[i] = int(b_split[i]) # Takes the current indices in the list and converts it to integers
    count += b_split[i] # Add up all of the integers values to get the total ratings
    avg_rate = count/len(b_split[6:len(b_split)]) # Takes the total ratings & divides it by the length

#The above basically calculates the average of the numbers like 4|5|4|3|3|4|4

    if (rest_type == b_split[5] and avg_rate >= min_rate):
        print b_split[0], avg_rate

结果的问题是......我得到了:

None

我知道这是一个非常非常长的问题,但如果有人能给我一些见解,我会很感激!

1 个答案:

答案 0 :(得分:0)

您是否尝试打印出汇总的所有信息?

找出错误发生的位置,无论是在您尝试解析特定餐馆时,还是直接解析任何内容并最终得到一个空白列表。