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python编程preview

用户5760343

发布于 2022-05-13 09:19:48

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代码可运行

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代码可运行

1、G.next()

2、pickle 用法

3、shelve

4、继承类的初始化写法：Obj.init

5 thinker

 from tkinter import *
 Label(text='Spam').pack()
 mainloop()
 6、thinker button
 from tkinter import *
 from tkinter.messagebox import showinfo
def reply():
 showinfo(title='popup', message='Button pressed!')
window = Tk()
 button = Button(window, text='press', command=reply)
 button.pack()
 window.mainloop()
 7、thinker Tk()/showinfo()/Entry()/Label()/Button()
 from tkinter import *
 from tkinter.messagebox import showinfo
def reply(name):
 showinfo(title='Reply', message='Hello %s!' % name)
top = Tk()
 top.title('Echo')

top.iconbitmap('py-blue-trans-out.ico')

Label(top, text="Enter your name:").pack(side=TOP)
 ent = Entry(top)
 ent.pack(side=TOP)
 btn = Button(top, text="Submit", command=(lambda: reply(ent.get())))
 btn.pack(side=LEFT)
top.mainloop()
 8、cgi::::::
 """
 Implement a web-based interface for viewing and updating class instances
 stored in a shelve; the shelve lives on server (same machine if localhost)
 """
import cgi, shelve, sys, os                   # cgi.test() dumps inputs
 shelvename = 'class-shelve'                   # shelve files are in cwd
 fieldnames = ('name', 'age', 'job', 'pay')
form = cgi.FieldStorage()                     # parse form data
 print('Content-type: text/html')              # hdr, blank line is in replyhtml
 sys.path.insert(0, os.getcwd())               # so this and pickler find person

main html template

replyhtml = """
 <html>
 <title>People Input Form</title>
 <body>
 <form method=POST action="peoplecgi.py">
 <table>
 <tr><th>key<td><input type=text name=key value="%(key)s">


 </table>
 <p>
 <input type=submit value="Fetch",  name=action>
 <input type=submit value="Update", name=action>
 </form>
 </body></html>
 """

insert html for data rows at

rowhtml  = '<tr><th>%s<td><input type=text name=%s value="%%(%s)s">\n'
 rowshtml = ''
 for fieldname in fieldnames:
 rowshtml += (rowhtml % ((fieldname,) * 3))
 replyhtml = replyhtml.replace('

', rowshtml)
def htmlize(adict):
 new = adict.copy()
 for field in fieldnames:                       # values may have &, >, etc.
 value = new[field]                         # display as code: quoted
 new[field] = cgi.escape(repr(value))       # html-escape special chars
 return new
def fetchRecord(db, form):
 try:
 key = form['key'].value
 record = db[key]
 fields = record.dict                   # use attribute dict
 fields['key'] = key                        # to fill reply string
 except:
 fields = dict.fromkeys(fieldnames, '?')
 fields['key'] = 'Missing or invalid key!'
 return fields
def updateRecord(db, form):
 if not 'key' in form:
 fields = dict.fromkeys(fieldnames, '?')
 fields['key'] = 'Missing key input!'
 else:
 key = form['key'].value
 if key in db:
 record = db[key]                       # update existing record
 else:
 from person import Person              # make/store new one for key
 record = Person(name='?', age='?')     # eval: strings must be quoted
 for field in fieldnames:
 setattr(record, field, eval(form[field].value))
 db[key] = record
 fields = record.dict
 fields['key'] = key
 return fields
db = shelve.open(shelvename)
 action = form['action'].value if 'action' in form else None
 if action == 'Fetch':
 fields = fetchRecord(db, form)
 elif action == 'Update':
 fields = updateRecord(db, form)
 else:
 fields = dict.fromkeys(fieldnames, '?')        # bad submit button value
 fields['key'] = 'Missing or invalid action!'
 db.close()
 print(replyhtml % htmlize(fields))                 # fill reply from dict