python编程preview
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 personmain 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本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
原始发表：2022-05-13，如有侵权请联系 cloudcommunity@tencent.com 删除
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