python pandas merge

Merge offline data of Baidu audio and video with python 2.3 format update, python2.3 It has not been updated for a long time. The resolution in four formats is supported. Filelist Slicelist Download. cfg Third_party_download.cfg Or two files. Replace the previous version. The preliminary test is normal, but the timeline is incorrect. # -*- coding: UTF-8 -*-import osimport ioimport codecsimport stringimport

The following are the main methods of list merging:1, using the Extend method of list, L1.extend (L2), the method adds all the elements of the parameter L2 to the tail of L1　　　　Results: [1, 2, 3, 4, 5, 1, 20, 30]2, with slicing (slice) operation, L1[len (L1): Len (L1)] = L2 and the above method equivalent　　　　Results: [1, 2, 3, 4, 5, 1, 20, 30]The slicing method is more flexible and can be inserted into the head, or any other part, for example:Add to start:　　　　Results: [10, 20, 30, 1, 2, 3, 4, 5]

1 >>> a = [1, 2, 3, 4, 5, 6]2 >>> Zip (* ([ITER (a)] * 2))3 [( 1, 2), (3, 4), (5, 6)]function form:1 Lambda A, k:zip (* ([ITER (a)] * k))2 >>> group_adjacent (A, 3)3 [(1 , 2, 3), (4, 5, 6)]4 >>> group_adjacent (A, 2)5 [(1, 2), (3, 4), (5, 6)]6 >>> group_adjacent (A, 1)7 [(1,), (2,), (3,), (4,), (5,), (6,)]Slice form:1 >>> zip (a[::2], a[1::2])2 [(1, 2), (3, 4), (5, 6)]3 4 >>> Zip (A[::3], A[1::3], A[2::3])5 [(1, 2, 3), (4, 5, 6)]List Deduction formula:1 Lambda for inch range (k))) 2 >>> g

1. Using the list's extend () method, the existing two lists are L1 and L2, respectively:1 >>> L1 = [1, 2, 3, 4, 5]2 >>> L2 = [, +]3 >> > l1.extend (L2)4 >>> L15 [1, 2, 3, 4, 5, 20, 30, 40]2. Using the slice (slice) operation, L1[len (L1): Len (L1)] = L2 is equivalent to the above method, for example:1 >>> L1 = [1, 2, 3, 4, 5]2 >>> L2 = [, +]3 >> > L1[len (L1): Len (L1)] = L245 >>> L16 [1, 2, 3, 4, 5, 20, 30, 40]The advantage of using a slicing method is that it is flexible and can be inserted a

" Connector characters ". Join (list or tuple or string or dictionary)Returns a string that is spliced with a connectorIf the object is a list, tuples are spliced in a subscript elementIf the object is a string, it is a word element that is spliced in unitsIf the object is a dictionary, it is stitched in a single key unitListIn [4]: a = ["123""123"]in ["". Join (a) In [6]: bout['123123'DictionaryIn []: a = {"fdasd":"adsf","afdasdf" :"asdf"}in ["". Join (a) in [+]: bout[ 'fdasdafdasdf'String" AS

1, add2, using the Extend method of the list, L1.extend (L2), the method adds all the elements of the parameter L2 to the tail of the L1, for example:3, with sectioning (Slice) operation, L1[len (L1): Len (L1)] = L2 and the above method equivalent,But the slicing method is more flexible and can be inserted into the head, or any other part, and can be added to the middle.How to merge two lists into a list in Python