Python2.7-difflib

Difflib is primarily used to compare the differences of two sequences, common to string comparisons, and to generate reports on variances.

Three classes are defined within the module: Sequencematcher, differ, Htmldiff

Differ class initialization has two optional parameters Linejunk accepts a function that has only one string argument, represents the ignored string, Charjunk accepts a single character function, represents the ignored character, and there is only one method in the class compare (A, A, b), Two sequences must be separate strings with \ n Split, for example from File.readlines ().

Htmldiff class initialization has four optional parameters,Tabsize=8,wrapcolumn=none, Linejunk and Charjunk Ibid, two methods Make_file and make_table in the class ( Fromlines, Tolines [, fromdesc][, todesc][, context][, Numlines]), From/todesc represents the file header string, which is generally empty, Context and Numlines generally default, red do not understand.

Sequencematcher (Isjunk=none, a= ", b=", autojunk=true) Isjunk can accept a single sequence of functions. In-class method Set_seqs (A, B), set_seq1 (a), SET_SEQ2 (a),

Find_longest_match (Alo,ahi,blo,bhi): Find the longest match from A[alo:ahi] and B[blo:bhi]

Get_matching_blocks (): Returns a list of three elements, containing the first and last matches, and the third element is the length of a, b

Get_opcodes (): To obtain a transition from A to B, there are 4 methods (' Replace ', ' delete ', ' equal ', ' insert ')

Get_grouped_opcodes ([n]): Gets the generator that transforms the N-line method

Ratio (): A and B similarity, if not run get_matching_blocks () or get_opcodes (), this method is time consuming, the following two methods can be used instead of

Quick_ratio (): Fast calculation

Real_quick_ratio (): The fastest calculation, no

In-module methods:

Context_diff (A, b[, fromfile][, tofile][, fromfiledate][, tofiledate][, n][, lineterm]): Compare A and B to return a generator in context_diff format

Ndiff (A, b[, linejunk][, Charjunk]): Compare A and B to return a generator in differ format

Unified_diff (A, b[, fromfile][, tofile][, fromfiledate][, tofiledate][, n][, lineterm]): Compare A and B to return a generator in unified_diff format

Get_close_matches (Word, possibilities[, n][, Cutoff]): n is the maximum number returned, cutoff is the threshold, below its mismatch, returns the optimal match result, from large to small arrangement

Restore (sequence, which): pushes the sequence generated from Ndiff or Differ.compare () back to the original sequence, with a which value of 1 or 2, representing the first/two sequences

Python2.7-difflib