Unique line of "Gelu"

         These two days “ grue ” The word frequency is hot , You know what is “ grue ” Do you ？

         Gelu sound comes from northeast dialect （ It's actually Shandong dialect ）, For daily life , Very different , The number of ways is not popular . To put it bluntly , Just a little maverick , unique .

         ha-ha , Don't say , It's also in the file “ grue ” Of , That is the unique line , Is a line different from any other line . They are silently mixed in repeated lines , There are no two brushes , It is difficult for you to quickly determine how many unique lines there are in a file .

        Python Sure .

Ideas ：

• Files are generally composed of unique lines and repeated lines , either this or that .
• aggregate The de duplication characteristic of
• list Removal function of

Code ：

f = open('file')    # ① Open the target file 
ls = f.readlines()    # ② Read the behavior list 
s1 = set(ls)    # ③ Convert list to set , The element is represented by repeating lines ＋ Unique line 

for i in s1:    # ④ Remove the rows after de duplication from the list one by one 
    ls.remove(i)

s2 = set(ls)    # ⑤ The list after transfer division is set , The element is represented by repeating lines 

print(' This article has {} Unique line '.format(len(s1)-len(s2)))

         Can also be based on Dictionaries Characteristics , Using the traversal method , With action key , The statistical corresponding value is 1 The line of ：

f = open('file')
d = {}
for i in f:
    d[i] = d.get(i, 0) + 1

count = 0
for k in d.keys():
    if d[k] == 1:
        count += 1

print(' This article has {} Unique line '.format(count))