計數刪除行

Question

如何從字符串中刪除重複的行，然後打印刪除的行數量？

我得到這個：

import os 


sentence = """Sentence1 
Sentence1 
Sentence2 
Sentence3 
Sentence4 
Sentence4""" 


spaces = sentence.replace(" ", "\n") #Makes one word per line 
lines = os.linesep.join([s for s in spaces.splitlines() if s]) #Removes empty lines 
duplicate = "\n".join(set(lines.split('\n'))) #Removes duplicate lines 


numberlines = len(duplicate.split('\n')) #Counts lines 



print(duplicate) 
print'Lines:', numberlines 

這樣，輸出是：

Sentence4 
Sentence1 
Sentence2 
Sentence3 
Lines: 4 

我怎樣才能達到這個輸出：

Sentence4 
Sentence1 
Sentence2 
Sentence3 
Lines: 4 
Removed Lines: 2 

感謝：d

Answer 1

讓我們來分析你的代碼逐行：

spaces = sentence.replace(" ", "\n") #Makes one word per line 

到目前爲止，一切都很好。

lines = os.linesep.join([s for s in spaces.splitlines() if s]) #Removes empty lines 

OK，所以你刪除空行，但最好是離開的結果作爲一個列表，而不是一起把它粘成一個字符串，因爲...：

duplicate = "\n".join(set(lines.split('\n'))) #Removes duplicate lines 

...在這裏你再次分裂它，並再次將結果結合成一個字符串...

numberlines = len(duplicate.split('\n')) #Counts lines 

...只能再次分割它。一個更好的版本：

spaces = sentence.split()     # Makes one word per line 
lines = [s for s in spaces if s]   # Removes empty lines 
duplicate = set(lines)     # Removes duplicate lines 
numberlines = len(duplicate)    # Counts lines 
removed_lines = len(lines) - numberlines 
print '\n'.join(duplicate) 
print 'Lines:', numberlines 
print 'Removed:', removed_lines 

Answer 2

您可以使用set：

Removed_lines = len(lines.split("\n")) - len(set(lines.split("\n"))) 

Answer 3

import os 



sentence = """Sentence1 
Sentence1 
Sentence2 
Sentence3 
Sentence4 
Sentence4""" 



spaces = sentence.replace(" ", "\n") 
lines = os.linesep.join([s for s in spaces.splitlines() if s]) 
duplicate = "\n".join(set(lines.split('\n'))) 

numberlinesprev = len(sentence.split('\n')) 
num1 = int(numberlinesprev) 

numberlines = len(duplicate.split('\n')) 
num2 = int(numberlines) 

sum = num1 - num2 



print(duplicate) 
print'Lines Removed:', sum 
print'Lines:', numberlines 

輸出：

Sentence4 
Sentence1 
Sentence2 
Sentence3 
Lines Removed: 2 
Lines: 4