Strings

Examples:

>>> x = chr(13)
->>> y = chr(13)
->>> id(x), id(y)
-(3082874688L, 3082874688L)
->>> x = chr(13) + chr(14)
->>> y = chr(13) + chr(14)
->>> id(x), id(y)
-(3077159616L, 3077159584L)
->>> x = "a"*20
->>> y = "a"*20
->>> z = "a"*21
->>> w = "a"*21
->>> id(x), id(y), id(z), id(w)
-(3079663488L, 3079663488L, 3079721328L, 3079721568L)
+File Handling and Iterables

+text2.py:def main(args):
+    prog = args[0]
+    filenames = args[1:]
+
+    for filename in filenames:
+        f = open(filename, "rb")
+
+        try:
+            for line in sorted(f):
+                print line,
+        finally:
+            f.close()
+
+        with open(filename, "rb") as f:
+            for i, line in enumerate(sorted(f)):
+                print "%3d: %s" % (i, line),
+
+        with open(filename, "rU") as f:
+            print f.read().replace("\n", r" \\ ")
 
 
-
-Single characters and empty string held in permament cache (Objects/stringobject.c).
-
-Constants strings of size <= 20 interned by parser.
-
-PyString_InternInPlace (PyUnicode_InternInPlace in 3.0) results in strings being stored in internal dictionary.Reference in interned not counted in reference count (nasty hack to hide this from users).
-
-
-Strings are replaced by Unicode in 3.0
 
-

Python 4 Programmers
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+

Index: /hodgestar/Talks/PythonForProgrammers/example/data/simple1.txt =================================================================== --- /hodgestar/Talks/PythonForProgrammers/example/data/simple1.txt (revision 727) +++ /hodgestar/Talks/PythonForProgrammers/example/data/simple1.txt (revision 727) @@ -0,0 +1,5 @@ +c +d +a +f1 +g Index: /hodgestar/Talks/PythonForProgrammers/example/text2.py =================================================================== --- /hodgestar/Talks/PythonForProgrammers/example/text2.py (revision 727) +++ /hodgestar/Talks/PythonForProgrammers/example/text2.py (revision 727) @@ -0,0 +1,28 @@ +#!/usr/bin/env python + +"""A Python script that re-implements some of the standard Unix text utils.""" + +def main(args): + prog = args[0] + filenames = args[1:] + + for filename in filenames: + f = open(filename, "rb") + + try: + for line in sorted(f): + print line, + finally: + f.close() + + with open(filename, "rb") as f: + for i, line in enumerate(sorted(f)): + print "%3d: %s" % (i, line), + + with open(filename, "rU") as f: + print f.read().replace("\n", r" \\ ") + +if __name__ == "__main__": + import sys + ret = main(sys.argv) + sys.exit(ret)