convert to dataframe python

Compile a Python script to convert a sqlAlchemy object to a dict tutorial, pythonsqlalchemy When using sqlAlchemy to write a web application, it often uses json for communication. The object closest to json is dict. Sometimes it is more convenient to operate dict than to operate ORM objects, after all, you don't have to worry about the database session status. Assume that there is a post table in the data

1. DictionariesDict = {' name ': ' Zara ', ' age ': 7, ' class ': ' First '}Dictionary converted to string, return: Print type (str (dict)), str (DICT)Dictionaries can be converted to tuples, returning: (' age ', ' name ', ' class ')Print tuple (dict)#字典能够转为元组, return: (7, ' Zara ', ' first ')Print tuple (dict.values ())Dictionary to list. return: [' age ', ' name ', ' class ']Print List (dict)Dictionary to ListPrint Dict.values2, meta-grouptup= (1, 2, 3, 4, 5)Tuple to String, return: (1, 2, 3,

#-*-coding:utf-8-*-#1, DictionariesDict = {' name ': ' Zara ', ' age ': 7, ' class ': ' First '}#字典转为字符串, return: Print type (str (dict)), str (DICT)#字典可以转为元组, return: (' age ', ' name ', ' class ')Print tuple (dict)#字典可以转为元组, return: (7, ' Zara ', ' first ')Print tuple (dict.values ())#字典转为列表, return: [' age ', ' name ', ' class ']Print List (dict)#字典转为列表Print Dict.values#2, tuplestup= (1, 2, 3, 4, 5)#元组转为字符串, return: (1, 2, 3, 4, 5)Print tup.__str__ ()#元组转为列表, return: [1, 2, 3, 4, 5]Print List

Demand is such, because now the camera pixel is very high, the photo is very big, upload to the online album too slow, so to first turn the size, before are directly in the online search image processing software, and then think about it, since the program, this demand can be done by themselves.Python picture processing cool crooked, a few lines of code to fix, here is the Pillow library.The code below.#coding =utf-8from PIL Import image# requires Pillow Library import glob, Osin_dir = ' tmp_pho

PS: Online directly to find, paste out, convenient to use at any time, thanks to the people who share.#!/usr/bin/python#encoding:utf-8import socketimport codecsimport mmapfrom struct import pack, Unpackdef decode_str (old ): "Specifically for pure GBK encoded string decompression returns UTF8 string ' ' Try:return Unicode (old, ' GBK '). Encode (' Utf-8 ') except: # when the string decoding fails, and the most byte value is ' \x96 ', remove it,

Reply:How to use PiL 123 fromPIL importImageimg =Image.open(‘image.png‘).convert(‘LA‘)img.save(‘greyscale.png‘) Using Matplotlib and the formula 1 Y‘ =0.299R +0.587G + 0.114B You can do this: 1234567891011 importnumpy as npimportmatplotlib.pyplot as pltimport matplotlib.image as mpimgdefrgb2gray(rgb):returnnp.dot(rgb[...,:3], [0.299, 0.587, 0.114])img = mpimg.im

In practical applications, sometimes we need to convert the Python program to EXE file for easy useFirst, the use of PIP directly installed Pyinstaller, almost one-click installation, very convenient.After installation, the CD is located to the installation path, PYINSYTANLLER-V can view the version of Pyinstaller, if you do not want to copy the files need to be converted to the installation path or enter a

given a string:It is a sequence of several values separated by commas:' 192.168.1.1,192.168.1.2,192.168.1.3 'How do I convert a string to a list?MSTR = ['192.168.1.1'192.168.1.2 ' 192.168.1.3']Use the Str.split method:' 192.168.1.1,192.168.1.2,192.168.1.3 '>>> mstr.split (",") ['192.168.1.1' '192.168.1.2'192.168.1.3']to turn a string into a tuple:>>> mlist = Mstr.split (",")>>> Tuple (mlist) (' 192.168.1.1'192.168.1.2'192.168.1.3 ')>>>Blog Handling

The example in this article describes how Python converts a picture to Black-and-white effect through PIL. Share to everyone for your reference. The specific analysis is as follows: PiL powerful, convert method can easily transform the picture, the following code can convert the picture to black and white effect From PIL import image image_file = Image.open

Convert a python datetime string to a Unix Timestamp Today, I encountered a problem when I used python to write a small program for capturing web pages. The time string on the page, for example, '(17:38:49)', needs to be converted UNIX timestamp. The strtotime function was previously written in PHP and was not found in Pytho