Linki

• przydatne składnie
• pythonware: introduction to tkinter

Snippety

1. class

   class Akcja:
     def __init__(self, par_bSkipInserts, par_nClearField):
       self.bSkipInserts = par_bSkipInserts
       self.nClearField = par_nClearField
   
   akcja = Akcja(True, None)
   
   #getting type name (typename)
   print type(akcja).__name__ # worse: akcja.__class__.__name__

2. command line

   sys.argv[1] - first command line argument

3. datetime

   from datetime import date
   date.today().strftime("%Y%m%d")

4. environment

   pip: run python get-pip.py

   d:\lang\python2\Scripts\pip.exe search lxml
   pip.exe install lxml
   pip instal downloaded-file.whl

5. error handling

   exit(1)
   
   try:
     print(1/0)
   except ZeroDivisionError:
     print("error")

6. file

   # -*- coding: utf-8 -*-
   
   import io
   import sys
   
   i = 0
   fin = open("test.txt")
   fin = io.open("testutf.txt", encoding='utf8')
   fout = open("wynik.txt", "w+t")
   # fout = io.open("wynik.txt", mode="w+t", encofing='utf8')
   sLinia = "start"
   while sLinia:
     sLinia = sys.stdin.readline()
     i = i + 1
     print(`i` + ": " + sLinia, end='', file=fout)
     fout.write(u'text w unicode')
   
   import glob
   for name in glob.glob('testing*08-05.txt'):
     print name
   fout.close()
   
   print name.encode(encoding="utf-8", errors="replace") #ignore

7. for

   for i in range(3):
       print "a"+`(i+1)`

8. goto

   class skip(Exception): pass
   
   try:
     if s1=="NAZWA KOLUMNY": raise skip
     doSomething()
   except skip:
     pass
   y += 1

9. listy i inne

   constants: True, False, None
   lista = []
   lista.append("element")
   mapa = dict()
   mapa["klucz"] = 444.3
   print(len(mapa))
   for keyValue in mapa.keys():
   slowo = list("jarek")
   slowo[0] = 'J' # string is immutable, but the list may be modified
   print "".join(slowo) # convert list to string
   "{0:02d}".format(i)
   
   if type(o) is str:
   if isintance(o, str):

10. messages

    import tkSimpleDialog
    test = tkSimpleDialog.askstring('Address', 'Where do we get the pictures from?'
    
    python3:
    from tkinter import *
    import tkinter.simpledialog
    import tkinter.messagebox
    
    Tk() #inicjalizacja
    tkinter.simpledialog.askstring("test", "test")
    tkinter.messagebox.showinfo("tytuł", "treść")
    
    

11. regex

    import re
    
    s = re.sub(r"[0-9]", "X", s)
    
    m = re.search("^create table\s`(.*)`", sLinia, re.I)
    if m!=None: sCurTable = m.group(1)
      print(m.string)
    patField = re.compile(sRegField, re.I)
    m = patField.search(sLinia, nPos)
    nPos = m.end()
    sLinia = sLinia[:m.start(0)] + "''" + sLinia[m.end(0)-1:]

12. timer

    def timerFun(timerApp):
      if timerApp.pbStop["state"]=="normal":
        timerApp.showTime()
      timerApp.timer = threading.Timer(1, timerFun, [timerApp])
      timerApp.timer.start()

13. tkinter

    from tkinter import *
    
    class TimerApp(Frame):
      def __init__(self, master=None):
        Frame.__init__(self, master)
        self.pbAddProj=Button(self, text="add project", underline="0", command=self.addProj)
        self.pbAddProj.pack(pady=5)
        self.lbProj = Listbox(self)
        self.lbProj.bind("<<ListboxSelect>>", self.projChanged)
        self.lbProj.pack(pady=5)
        frame = Frame(self)
        self.pbStart = Button(frame, text="start", underline="0", command=self.start)
        self.pbStart.pack(pady=5, padx=5, side="left")
        frame.pack()
        self.master.minsize(300, 0)
        self.master.title("ProjectTimer")
        self.master.iconbitmap("C:\Bonanza\www\joomla\\bswww\\b.ico")
        self.pack(pady=5)
    
    app = TimerApp()
    app.mainloop()

14. uppercase / lowercase

    import locale
    locale.setlocale(locale.LC_ALL, 'pl_PL.utf8')
    
    sTekst = sTekst.upper() # lower(), title()

15. url

    import urllib
    urllib.quote("address?asdf=45&x=y")

16. xml

      def saveSettings(self):
        self.xml = xml.dom.getDOMImplementation().createDocument(None, None, None)
        eMain = self.xml.appendChild(self.xml.createElement("TimerProj"))
        eMain.appendChild(self.xml.createTextNode("\n"))
        for p in self.projects:
          proj = self.projects[p]
          eProj = self.xml.createElement("project")
          eProj.attributes["name"] = proj.sName
          eProj.attributes["time"] = str(proj.fTime)
          eMain.appendChild(eProj)
          eMain.appendChild(self.xml.createTextNode("\n"))
        self.xml.writexml(open(self.settingsFile(), "w"))
      
      def loadSettings(self):
        self.projects.clear()
        doc = xml.dom.minidom.parse(self.settingsFile())
        eMain = doc.getElementsByTagName("TimerProj")[0] #doc.firstchild()
        for eProj in eMain.getElementsByTagName("project"):
          proj = Project(eProj.attributes["name"].value, float(eProj.attributes["time"].value))
          self.projects[proj.sName] = proj
          self.lbProj.insert("end", proj.sName)
    
    def getElemStr(parent, sName):
      s = ""
      for node in parent.getElementsByTagName(sName):
        for ch in node.childNodes:
          if ch.nodeType == node.TEXT_NODE:
            s += ch.nodeValue
      return s