python - 如何在Python中显示没有公共(public)行的列表差异？

Question

在两个列表之间进行比较后，将显示公共(public)行。但我的要求是，当我比较两个列表时，不应显示公共(public)行(位于差异中)。你能给出一些如何抑制它的想法吗？

difflist.py
-----------

import difflib


def main():
  rawfromlines = open('file1.sql', 'r').readlines()
  tolines = open('file2.sql', 'r').readlines()

  list_f1 = []
  list_f2 = []

  for f1 in rawfromlines:
     for part in f1.replace('\n','').split(','):
       list_f1.append(part)

  for f2 in tolines:
     for part in f2.replace('\n','').split(','):
       list_f2.append(part)


  targetfile = open('diff_of_files.sql', 'w')

  differ = difflib.Differ()
  diffs = list(differ.compare(list_f1, list_f2))

  for i in range(0,len(diffs)):
    print diffs[i]

file1.sql
----------

CREATE TABLE SALARY
(
 SALARY int
);
CREATE TABLE JOB1
(
 EMP1 int
);

file2.sql
---------
CREATE TABLE SALARY
(
 EMPNAME VARCHAR2(255)
 SALARY int
);
CREATE TABLE JOB1
(
 EMP1 int
);

Actual Output
---------------
CREATE TABLE SALARY
  (
+  EMPNAME VARCHAR2(255)
   SALARY int
  );
  CREATE TABLE JOB1
  (
   EMP1 int
  );

Expected Output
---------------

CREATE TABLE SALARY
  (
+  EMPNAME VARCHAR2(255)
   SALARY int
  );

公共(public)线不存在。

Answer 1

不幸的是，Differ 没有任何像 HtmlDiff 那样打印上下文的功能。但是，您可以通过保留上下文行缓冲区来轻松地自己构建类似的东西。像这样的事情:

def print_with_context (diff, context = 3):
    buf = []
    print_more = 0

    for line in diff:
        if line.startswith('-') or line.startswith('+'):
            if len(buf) > context:
                print('...')
            print('\n'.join(buf[-context:]))
            buf = []
            print_more = context
            print(line)
        elif print_more:
            print(line)
            print_more -= 1
            if print_more == 0:
                print('...')
        else:
            buf.append(line)

像这样使用:

print_with_context(differ.compare(list_f1, list_f2), 2)