python convert dataframe to list

The Append () method usesFirst look at the description in the official documentation:List.extend (L) Extend the list by appending all the items in the given list; Equivalent to A[len (a):] = L.The translation into Chinese is: by appending all elements to the known list to augment it, equivalent to A[len (a):]= LFor example, I can understand this sentence better.>

;>> id (a) 3 46281096L 4 >>>. append (4) # append an element. If no return value is returned, this is an external representation of in-situ modification. 5 >>> a 6 [1, 2, 3, 4] 7 >>> id (a) # after appending, the position of the list in the memory has not changed 8 46281096L 9> a [1] = 9 # The list can also be modified as follows: Change the element whose index position is 1 to 9,

type is 0.0str float: 123.01int floating point type to float: 32.0 create a plural number (real part + virtual part): (12 + 43j) create a plural number (real part + virtual part): (12 + 0j) str () by default, the float character type is converted to str: 232.33int floating point type to str: 32 list to str: abecda sequence strs to list: ['H', 'O ', 'N', 'G', 'T', 'e', 'n']

elements of the list x to build a dictionary, the key value is the list of each element, value is None4. Get (key) to find value based on key5. Hash_key (x) find if the dictionary contains a key value x6. Update (x) updating another dictionary with one dictionary7, Popitem () delete the last element and return8, Pop (key) delete the key value corresponding to the element9. Items () Converts the dictionary

First, Python support for JSONStarting with python2.6, JSON support has been added to the Python standard library, and it is only necessary to manipulate the JSON import json .Second, the Python object is converted into a JSON stringWhen you convert a Python object to a JSON

This time brings you to python how to convert matrices to lists, Python to convert the matrix to list of considerations, the following is the actual case, take a look. This article focuses on some of the functions in Python's numpy library and makes backups to find them. (1

= ' Hongten ' Print (' sequence STRs converted to list: ', List (STRs)) #covert to tuple print (' list conversion to tuple: ', tuple (lists)) #字符和整数之间的转换 # Char coverted to Intprint (' integer converted to character Chr: ', CHR) print (' character CHR converts to an integer: ', ORD (' C ')) print (' int to 16 decimal: ', Hex ()) print (' int to 8 decimal: ', Oct

Python to convert the ancestor to an array This article mainly introduces how to convert the ancestor of python into an array. It involves the usage skills of the list Method in Python. For more information, see This example des

\ Site-packages \ py2exe \ Samples Directory. Iii. Usage of py2exe If you have a file named myscript. you want to convert the Python script of Py to an executable program running on Windows and run it on a Windows system without Python installed, first, you should write a setup script for the release program, such as mysetup. PY, insert the statement import