@@ -0,0 +1,26 @@
+--- makeTextFile.py	2006-01-29 21:29:44.000000000 -0700
++++ makeTextFile-fix.py	2006-10-11 21:49:35.000000000 -0700
+@@ -3,11 +3,10 @@
+'makeTextFile.py -- create text file'
+
+import os
+-ls = os.linesep
+
+# get filename
+while True:
+-
++ fname = raw_input('Enter file name: ')
+if os.path.exists(fname):
+print"*** ERROR: '%s' already exists" % fname
+else:
+@@ -25,8 +24,8 @@
+else:
+all.append(entry)
+
+-# write lines to file with proper line-ending
++# write lines to file with NEWLINE line terminator
+fobj = open(fname, 'w')
+-fobj.writelines(['%s%s' % (x, ls) for x in all])
++fobj.write('\n'.join(all))
+fobj.close()
+print 'DONE!'

@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+
+'makeTextFile.py -- create text file'
+
+import os
+
+# get filename
+while True:
+fname = raw_input('Enter file name: ')
+if os.path.exists(fname):
+print"*** ERROR: '%s' already exists" % fname
+else:
+break
+
+# get file content (text) lines
+all = []
+print "\nEnter lines ('.' by itself to quit).\n"
+
+# loop until user terminates input
+while True:
+entry = raw_input('> ')
+if entry == '.':
+break
+else:
+all.append(entry)
+
+# write lines to file with NEWLINE line terminator
+fobj = open(fname, 'w')
+fobj.write('\n'.join(all))
+fobj.close()
+print 'DONE!'

@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+
+'makeTextFile.py -- create text file'
+
+import os
+ls = os.linesep
+
+# get filename
+while True:
+
+if os.path.exists(fname):
+print"*** ERROR: '%s' already exists" % fname
+else:
+break
+
+# get file content (text) lines
+all = []
+print "\nEnter lines ('.' by itself to quit).\n"
+
+# loop until user terminates input
+while True:
+entry = raw_input('> ')
+if entry == '.':
+break
+else:
+all.append(entry)
+
+# write lines to file with proper line-ending
+fobj = open(fname, 'w')
+fobj.writelines(['%s%s' % (x, ls) for x in all])
+fobj.close()
+print 'DONE!'

@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+
+'makeTextFile.py -- create text file'
+
+import os
+ls = os.linesep
+
+# get filename
+while True:
+fname = raw_input('Enter file name: ')
+if os.path.exists(fname):
+print"*** ERROR: '%s' already exists" % fname
+else:
+break
+
+# get file content (text) lines
+all = []
+print "\nEnter lines ('.' by itself to quit).\n"
+
+# loop until user terminates input
+while True:
+entry = raw_input('> ')
+if entry == '.':
+break
+else:
+all.append(entry)
+
+# write lines to file with proper line-ending
+fobj = open(fname, 'w')
+fobj.writelines(['%s%s' % (x, ls) for x in all])
+fobj.close()
+print 'DONE!'

@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+
+'readTextFile.py -- read and display text file'
+
+# get filename
+fname = raw_input('Enter file name: ')
+print
+
+# attempt to open file for reading
+try:
+fobj = open(fname, 'r')
+except IOError, e:
+print"*** file open error:", e
+else:
+# display contents to the screen
+for eachLine in fobj:
+print eachLine,
+fobj.close()

@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+
+def displayNumType(num):
+print num, 'is',
+if isinstance(num, (int, long, float, complex)):
+print 'a number of type:', type(num).__name__
+else:
+print 'not a number at all!!'
+
+displayNumType(-69)
+displayNumType(9999999999999999999999L)
+displayNumType(98.6)
+displayNumType(-5.2+1.9j)
+displayNumType('xxx')

@@ -0,0 +1,14 @@
+#!/usr/bin/python
+
+s = 'abcde'
+
+#for x,y in enumerate(s):
+# print s[x:], s[:x]
+#for i in range(len(s), -1, -1):
+#print s[i:], s[:i], s[i::-1], s[:i:-1]
+
+s = 'abcde'
+for i in [None] + range(-1, -len(s), -1):
+print s[:i]
+
+raw_input()

@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+'''
+$Id$
+
+idcheck.py -- checks identifiers for validity
+
+This application is limited in that it currently only supports
+checking identifiers with length > 1 (does not process identifiers
+of length greater than 1. This application also does not recognize
+do keywords.
+
+Exercise:
+
+6-2) update this script to process identifiers of length 1
+as well as recognizing keywords as invalid identifiers
+(for use by the programmer; they are valid Python
+identifiers otherwise).
+'''
+
+import string # string utility module
+
+# create alphabet and number sets
+alphas = string.letters + '_'
+nums = string.digits
+
+# salutation message and input prompt
+print 'Welcome to the Identifier Checker v1.0'
+print 'Testees must be at least 2 chars long.'
+inp = raw_input('Identifier to test? ')
+
+# only take action for identifiers with length > 1
+if len(inp) > 1:
+
+# first character must be alphabetic
+if inp[0] not in alphas:
+print 'invalid: first symbol must be alphabetic'
+
+# remaning characters can be alphanumeric
+else:
+for otherChar in inp[1:]:
+if otherChar not in alphas + nums:
+print 'invalid: remaining symbols must be alphanumeric'
+break
+else:
+print "okay as an identifier"
+else:
+print 'invalid: length must be > 1'

@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+
+from keyword import kwlist
+import string
+
+ALPHAS = string.ascii_letters + '_'
+NUMS = string.digits
+
+def main():
+print 'Welcome to the Identifier Checker v2.0'
+myInput = raw_input('Identifier to test? ').strip()
+
+if len(myInput) == 0:
+print "ERROR: no identifier candidate entered"
+return
+
+if myInput in kwlist:
+print "ERROR: %r is a keyword" % myInput
+return
+
+alnums = ALPHAS + NUMS
+for i, c in enumerate(myInput):
+if i == 0 and c not in ALPHAS:
+print 'ERROR: first symbol must be alphabetic'
+break
+if c not in alnums:
+print 'ERROR: remaining symbols must be alphanumeric'
+break
+else:
+print "okay as an identifier"
+
+if __name__ == '__main__':
+main()

@@ -0,0 +1,30 @@
+#!/usr/bin/python
+
+from time import time
+REPS = 17500
+
+def insert():
+m = [None]
+i = 0
+now = time()
+while i < REPS:
+m.insert(0, i)
+i += 1
+print 'Elapsed (insert):', time() - now
+
+def colonZero():
+m = [None]
+i = 0
+now = time()
+while i < REPS:
+m[:0] = [i]
+i += 1
+print 'Elapsed (colon-0):', time() - now
+
+def main():
+insert()
+colonZero()
+
+if __name__ == '__main__':
+main()
+raw_input()

@@ -0,0 +1,91 @@
+#!/usr/bin/env python
+'''
+$Id$
+
+queue.py -- simulate queue data structures using lists
+
+NOTE: as of the time of publication, there is a bug in JPython1.1
+that does not recognize arguments for the list pop() method:
+TypeError: pop(): expected 0 args; got 1
+
+Exercises:
+
+13-9) create a Queue class
+
+13-10) create a class similar to arrays in Perl which have
+both queue- and stack-like qualities and features
+'''
+
+# create our data structure
+queue = []
+
+#
+# enQ() -- add string to end of queue
+#
+def enQ():
+queue.append(raw_input('Enter new queue element: '))
+
+#
+# deQ() -- remove string from front of queue
+#
+def deQ():
+if len(queue) == 0:
+print 'Cannot dequeue from empty queue!'
+else:
+print 'Removed [', queue.pop(0), ']'
+
+#
+# viewQ() -- display queue contents
+#
+def viewQ():
+print str(queue)
+
+#
+# showmenu() -- interactive portion of application
+# displays menu to prompt user and takes
+# action based on user response
+#
+def showmenu():
+prompt = """
+(E)nqueue
+(D)equeue
+(V)iew
+(Q)uit
+
+Enter choice: """
+
+# loop until user quits
+done = 0
+while not done:
+
+# loop until user choses valid option
+chosen = 0
+while not chosen:
+
+# if user hits ^C or ^D (EOF),
+# pretend they typed 'q' to quit
+try:
+choice = raw_input(prompt)[0]
+except (IndexError, EOFError, KeyboardInterrupt):
+choice = 'q'
+print '\nYou picked: [%s]' % choice
+
+# validate option chosen
+if choice not in 'devq':
+print 'invalid option, try again'
+else:
+chosen = 1
+
+# take appropriate action
+if choice == 'q':
+done = 1
+if choice == 'e':
+enQ()
+if choice == 'd':
+deQ()
+if choice == 'v':
+viewQ()
+
+# run showmenu() as the application
+if __name__ == '__main__':
+showmenu()