git

Author: 罗晟

ch03/makeTextFile.diff

@@ -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!'

ch03/makeTextFile.py

@@ -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!'

ch03/makeTextFile0.py

@@ -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!'

ch03/makeTextFile1.py

@@ -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!'

ch03/readTextFile.py

@@ -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()

ch04/typechk.py

@@ -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')

ch06/alt/NoneIndex.py

@@ -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()

ch06/alt/idcheck.py

@@ -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'

ch06/alt/idcheck2.py

@@ -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()

ch06/alt/insertVsColonZero.py

@@ -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()