UnicodeDecodeError: 'charmap' codec can't decode byte 0x81 in position 308: character maps to undefined

2014-11-14 Thread satishmlmlml 
For 'mimetypes' in the code given below, python is giving the following error. 
Kindly help.

 import os
 matches = []
 for (dirname, dirshere, fileshere) in os.walk(r'C:\Python34'):
for filename in fileshere:
if filename.endswith('.py'):
pathname = os.path.join(dirname, filename)
if 'mimetypes' in open(pathname).read():
matches.append(pathname)


Traceback (most recent call last):
  File pyshell#165, line 5, in module
if 'mimetypes' in open(pathname).read():
  File C:\Python34\lib\encodings\cp1252.py, line 23, in decode
return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x81 in position 308: 
character maps to undefined
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How to recover bytes function?

2014-11-13 Thread satishmlmlml 
file = open('data.bin', 'rb')
bytes = file.read()
bytes
b'\x00\x00\x00\x02spam\x00\x03?\x9d\xf3\xb6'
records = [bytes([char] * 8) for char in b'spam']
TypeError: 'bytes' object is not callable

How to recover bytes function?
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io.UnsupportedOperation: fileno

2014-11-13 Thread satishmlmlml 
import sys
for stream in (sys.stdin, sys.stdout, sys.stderr):
   print(stream.fileno())


io.UnsupportedOperation: fileno
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Re: io.UnsupportedOperation: fileno

2014-11-13 Thread satishmlmlml 
What is the problem and how to overcome this problem?
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Re: io.UnsupportedOperation: fileno

2014-11-13 Thread satishmlmlml 
fileno() in not supported. Is it only in 3.1? What is the workaround?
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Bad file descriptor

2014-11-13 Thread satishmlmlml 
import os
os.write(1, b'Hello descriptor world\n')
OSError: Bad file descriptor

How to give a file descriptor number to this function? How to get a file 
descriptor number?
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fileno() not supported in Python 3.1

2014-11-13 Thread satishmlmlml 
import sys 
for stream in (sys.stdin, sys.stdout, sys.stderr): 
   print(stream.fileno()) 


io.UnsupportedOperation: fileno 

Is there a workaround?
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Re: fileno() not supported in Python 3.1

2014-11-13 Thread satishmlmlml 
How to get file descriptor number for the following:
sys.stdin
sys.stdout
sys.stderr

It is displaying io.UnsupportedOperation: fileno error

Kindly help.
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How to get file descriptors of sys.stdin, sys.stdout and sys.stderr?

2014-11-13 Thread satishmlmlml 
How to get file descriptors of sys.stdin, sys.stdout and sys.stderr?
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How to get file descriptors of sys.stdin, sys.stdout and sys.stderr?

2014-11-13 Thread satishmlmlml 
How to get file descriptors of sys.stdin, sys.stdout and sys.stderr?

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What is \1 here?

2014-11-11 Thread satishmlmlml 
What does \1 do in the following piece of code(fourth line)?
import re
print(re.sub('[ABC]', '*', 'XAXAXBXBXCXC'))
print(re.sub('[ABC]_', '*', 'XA-XA_XB-XB_XC-XC_'))
print(re.sub('(.) spam', 'spam\\1', 'x spam, y spam'))
def mapper(matchobj):
   return 'spam' + matchobj.group(1)
print(re.sub('(.) spam', mapper, 'x spam, y spam'))

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What is ?s here?

2014-11-11 Thread satishmlmlml 
What does ?s do in the following piece of code?

import re, pprint
text = open('books.xml').read()
pattern = '(?s)isbn=(.*?).*?title(.*?)/title'
found = re.findall(pattern, text)
mapping = {isbn: title for (isbn, title) in found}
pprint.pprint(mapping)

Here is books.xml

catalog
   book isbn=0-596-00128-2
 titlePython amp; XML/title
 dateDecember 2001/date
 authorJones, Drake/author
   /book
/catalog
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What does (?Pname) pattern syntax do?

2014-11-10 Thread satishmlmlml 
What does ?P and part1 match in the following piece of code?

re.search('(?Ppart1\w*)/(?Ppart2\w*)', '...aaa/bbb/ccc]').groups()
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What is description attribute in python?

2014-11-09 Thread satishmlmlml 
What does description attribute in the following code mean?

curs.execute('select * from people')
colnames = [desc[0] for desc in curs.description]

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What does zip mean?

2014-11-09 Thread satishmlmlml 
What does zip return in the following piece of code?

curs.execute('select * from people')
colnames = [desc[0] for desc in curs.description]
rowdicts = []
for row in curs.fetchall():
   rowdicts.append(dict(zip(colnames, row)))

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Re: What is description attribute in python?

2014-11-09 Thread satishmlmlml 
curs is coming from the following piece of code

import sqlite3
conn = sqlite3.connect('dbase1')
curs = conn.cursor()
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What is rstrip() in python?

2014-11-09 Thread satishmlmlml 
What is rstrip() in python?

What does it do in the following piece of code?

import sqlite3
conn = sqlite3.connect('dbase1')
curs = conn.cursor()

file = open('data.txt')
rows = [line.rstrip().split(',') for line in file]
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Popen class?

2014-10-31 Thread satishmlmlml 
What is Popen class?
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%%(%s)s mean in python

2014-10-29 Thread satishmlmlml 
def fetchRecord(db, form): 
 try: 
  key = form['key'].value 
  record = db[key] 
  fields = record.__dict__ 
  fields['key'] = key 
 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] 
 else: 
   from person import Person 
   record = Person(name='?', age='?') 
 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, '?') 
 fields['key'] = 'Missing or invalid action!' 
db.close() 
print(replyhtml % htmlize(fields)) 

What does %%(%s)s mean in Python?
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Re: %%(%s)s mean in python

2014-10-29 Thread satishmlmlml 
also
what does
rowshtml += (rowhtml % ((fieldname,) * 3)) expand to?
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What does %%(%s)s mean/expand to in Python? What does rowshtml += (rowhtml % ((fieldname, ) * 3)) expand to? Kindly explain.

2014-10-29 Thread satishmlmlml 
def fetchRecord(db, form): 
 try: 
  key = form['key'].value 
  record = db[key] 
  fields = record.__dict__ 
  fields['key'] = key 
 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] 
 else: 
   from person import Person 
   record = Person(name='?', age='?') 
 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, '?') 
 fields['key'] = 'Missing or invalid action!' 
db.close() 
print(replyhtml % htmlize(fields)) 

What does %%(%s)s mean in Python? 

also 
what does 
rowshtml += (rowhtml % ((fieldname,) * 3)) expand to? 
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% symbol in python

2014-10-28 Thread satishmlmlml 
trthkeytdinput type=text name=key value=%(key)s
rowhtml = 'trth%stdinput type=text name=%s value%%(%s)s\n

what does % mean in first line of code and
what does %%(%s)s mean in second line of code

kindly explain
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Re: % symbol in python

2014-10-28 Thread satishmlmlml 
import cgi, shelve, sys, os
shelvename = 'class-shelve'
fieldnames = ('name', 'age', 'job', 'pay')
form = cgi.FieldStorage()
print('Content-type: text/html')
sys.path.insert(0, os.getcwd())
replyhtml = 
html
titlePeople Input Form/title
body
form method=POST action=peoplecgi.py
table
trthkeytdinput type=text name=key value=%(key)s
$ROWS$
/table
p
input type=submit value=Fetch, name=action
input type=submit value=Update, name=action
/form
/body/html

rowhtml = 'trth%stdinput type=text name=%s value=%%(%s)s\n'
rowshtml = ''
for fieldname in fieldnames:
rowshtml += (rowhtml % ((fieldname, ) * 3))
replyhtml = replyhtml.replace('$ROWS$', rowshtml)
def htmlize(adict):
new = adict.copy()
for field in fieldnames:
value = new[field]
new[field] = cgi.escape(repr(value))
return new

def fetchRecord(db, form):
try:
key = form['key'].value
record = db[key]
fields = record.__dict__
fields['key'] = key
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]
else:
from person import Person
record = Person(name='?', age='?')
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, '?')
fields['key'] = 'Missing or invalid action!'
db.close()
print(replyhtml % htmlize(fields))
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Re: % symbol in python

2014-10-28 Thread satishmlmlml 
import cgi, shelve, sys, os 
shelvename = 'class-shelve' 
fieldnames = ('name', 'age', 'job', 'pay') 
form = cgi.FieldStorage() 
print('Content-type: text/html') 
sys.path.insert(0, os.getcwd()) 
replyhtml =  
html 
titlePeople Input Form/title 
body 
form method=POST action=peoplecgi.py 
 table 
 trthkeytdinput type=text name=key value=%(key)s 
 $ROWS$ 
 /table 
 p 
 input type=submit value=Fetch, name=action 
 input type=submit value=Update, name=action 
/form 
/body/html 
 
rowhtml = 'trth%stdinput type=text name=%s value=%%(%s)s\n' 
rowshtml = '' 
for fieldname in fieldnames: 
 rowshtml += (rowhtml % ((fieldname, ) * 3)) 
 replyhtml = replyhtml.replace('$ROWS$', rowshtml) 
def htmlize(adict): 
 new = adict.copy() 
 for field in fieldnames: 
  value = new[field] 
  new[field] = cgi.escape(repr(value)) 
 return new 

def fetchRecord(db, form): 
 try: 
  key = form['key'].value 
  record = db[key] 
  fields = record.__dict__ 
  fields['key'] = key 
 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] 
 else: 
   from person import Person 
   record = Person(name='?', age='?') 
 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, '?') 
 fields['key'] = 'Missing or invalid action!' 
db.close() 
print(replyhtml % htmlize(fields)) 


kindly let me know what is $ROWS$ along with % symbol's meaning
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Re: % symbol in python

2014-10-28 Thread satishmlmlml 
kindly let me know 
what does
%%(%s)% mean 
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