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Changeset 727

Timestamp:

03/05/10 21:38:58 (5 months ago)

Author:

hodgestar

Message:

File handling slide.

Location:

hodgestar/Talks/PythonForProgrammers

Files:

: 3 added
: 5 modified

. (modified) (1 prop)
example/data (added)
example/data/simple1.txt (added)
example/text2.py (added)
html/py4progs-0.html (modified) (1 diff)
html/py4progs-3.html (modified) (1 diff)
html/py4progs-4.html (modified) (1 diff)
slides/py4prog.py (modified) (3 diffs)

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hodgestar/Talks/PythonForProgrammers
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hodgestar/Talks/PythonForProgrammers/html/py4progs-0.html

r726	r727
11	11	<li><a href='py4progs-2.html'>Course Structure</a></li>
12	12	<li><a href='py4progs-3.html'>Numeric and Sequence Types</a></li>
	13	<li><a href='py4progs-4.html'>File Handling and Iterables</a></li>
13	14	</ol>
14	15	<br /></body></html>

hodgestar/Talks/PythonForProgrammers/html/py4progs-3.html

r726	r727
33	33	<li>IPython is awesome.</li>
34	34	</ul>
35		</div><br /><div class="footer"><hr /><div style="float: left; font-style: italic;">Python 4 Programmers</div><div style="float: right;"><a accesskey="P" href="py4progs-2.html">Prev</a> \| <a accesskey="I" href="py4progs-0.html">Index</a> \| ~~Next~~</div></div></body></html>
	35	</div><br /><div class="footer"><hr /><div style="float: left; font-style: italic;">Python 4 Programmers</div><div style="float: right;"><a accesskey="P" href="py4progs-2.html">Prev</a> \| <a accesskey="I" href="py4progs-0.html">Index</a> \| <a accesskey="N" href="py4progs-4.html">Next</a></div></div></body></html>

hodgestar/Talks/PythonForProgrammers/html/py4progs-4.html

r726	r727
6	6	</head>
7	7	<body>
8		<div style='margin: auto; width: 50%;'><h2>Strings</h2><ul>
9		<li>Examples:<div class="highlight"><pre><span class="gp">>>> </span><span class="n">x</span> <span class="o">=</span> <span class="nb">chr</span><span class="p">(</span><span class="mf">13</span><span class="p">)</span>
10		<span class="gp">>>> </span><span class="n">y</span> <span class="o">=</span> <span class="nb">chr</span><span class="p">(</span><span class="mf">13</span><span class="p">)</span>
11		<span class="gp">>>> </span><span class="nb">id</span><span class="p">(</span><span class="n">x</span><span class="p">),</span> <span class="nb">id</span><span class="p">(</span><span class="n">y</span><span class="p">)</span>
12		<span class="go">(3082874688L, 3082874688L)</span>
13		<span class="gp">>>> </span><span class="n">x</span> <span class="o">=</span> <span class="nb">chr</span><span class="p">(</span><span class="mf">13</span><span class="p">)</span> <span class="o">+</span> <span class="nb">chr</span><span class="p">(</span><span class="mf">14</span><span class="p">)</span>
14		<span class="gp">>>> </span><span class="n">y</span> <span class="o">=</span> <span class="nb">chr</span><span class="p">(</span><span class="mf">13</span><span class="p">)</span> <span class="o">+</span> <span class="nb">chr</span><span class="p">(</span><span class="mf">14</span><span class="p">)</span>
15		<span class="gp">>>> </span><span class="nb">id</span><span class="p">(</span><span class="n">x</span><span class="p">),</span> <span class="nb">id</span><span class="p">(</span><span class="n">y</span><span class="p">)</span>
16		<span class="go">(3077159616L, 3077159584L)</span>
17		<span class="gp">>>> </span><span class="n">x</span> <span class="o">=</span> <span class="s">"a"</span><span class="o">*</span><span class="mf">20</span>
18		<span class="gp">>>> </span><span class="n">y</span> <span class="o">=</span> <span class="s">"a"</span><span class="o">*</span><span class="mf">20</span>
19		<span class="gp">>>> </span><span class="n">z</span> <span class="o">=</span> <span class="s">"a"</span><span class="o">*</span><span class="mf">21</span>
20		<span class="gp">>>> </span><span class="n">w</span> <span class="o">=</span> <span class="s">"a"</span><span class="o">*</span><span class="mf">21</span>
21		<span class="gp">>>> </span><span class="nb">id</span><span class="p">(</span><span class="n">x</span><span class="p">),</span> <span class="nb">id</span><span class="p">(</span><span class="n">y</span><span class="p">),</span> <span class="nb">id</span><span class="p">(</span><span class="n">z</span><span class="p">),</span> <span class="nb">id</span><span class="p">(</span><span class="n">w</span><span class="p">)</span>
22		<span class="go">(3079663488L, 3079663488L, 3079721328L, 3079721568L)</span>
	8	<div style='margin: auto; width: 50%;'><h2>File Handling and Iterables</h2><ul>
	9	<li>text2.py:<div class="highlight"><pre><span class="k">def</span> <span class="nf">main</span><span class="p">(</span><span class="n">args</span><span class="p">):</span>
	10	<span class="n">prog</span> <span class="o">=</span> <span class="n">args</span><span class="p">[</span><span class="mf">0</span><span class="p">]</span>
	11	<span class="n">filenames</span> <span class="o">=</span> <span class="n">args</span><span class="p">[</span><span class="mf">1</span><span class="p">:]</span>
	12
	13	<span class="k">for</span> <span class="n">filename</span> <span class="ow">in</span> <span class="n">filenames</span><span class="p">:</span>
	14	<span class="n">f</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s">"rb"</span><span class="p">)</span>
	15
	16	<span class="k">try</span><span class="p">:</span>
	17	<span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="n">sorted</span><span class="p">(</span><span class="n">f</span><span class="p">):</span>
	18	<span class="k">print</span> <span class="n">line</span><span class="p">,</span>
	19	<span class="k">finally</span><span class="p">:</span>
	20	<span class="n">f</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
	21
	22	<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s">"rb"</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
	23	<span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">line</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">sorted</span><span class="p">(</span><span class="n">f</span><span class="p">)):</span>
	24	<span class="k">print</span> <span class="s">"</span><span class="si">%3d</span><span class="s">: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="n">line</span><span class="p">),</span>
	25
	26	<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s">"rU"</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
	27	<span class="k">print</span> <span class="n">f</span><span class="o">.</span><span class="n">read</span><span class="p">()</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="s">r" </span><span class="se">\\</span><span class="s"> "</span><span class="p">)</span>
23	28	</pre></div>
24	29	</li>
25
26		~~<li>Single characters and empty string held in permament cache (Objects/stringobject.c).</li>~~
27
28		~~<li>Constants strings of size <= 20 interned by parser.</li>~~
29
30		<li>PyString_InternInPlace (PyUnicode_InternInPlace in 3.0) results in strings being stored in internal dictionary.<ul><li>Reference in interned not counted in reference count (nasty hack to hide this from users).</li>
31		~~</ul></li>~~
32
33		~~<li>Strings are replaced by Unicode in 3.0</li>~~
34	30	</ul>
35		</div><br /><div class="footer"><hr /><div style="float: left; font-style: italic;">Python 4 Programmers</div><div style="float: right;"><a accesskey="P" href="py4progs-3.html">Prev</a> \| <a accesskey="I" href="py4progs-0.html">Index</a> \| ~~<a accesskey="N" href="py4progs-5.html">Next</a>~~</div></div></body></html>
	31	</div><br /><div class="footer"><hr /><div style="float: left; font-style: italic;">Python 4 Programmers</div><div style="float: right;"><a accesskey="P" href="py4progs-3.html">Prev</a> \| <a accesskey="I" href="py4progs-0.html">Index</a> \| Next</div></div></body></html>

hodgestar/Talks/PythonForProgrammers/slides/py4prog.py

r726	r727
84	84
85	85	Slide("Course Structure",
86		Bullet("First Script:", PYCODE('''
	86	Bullet("First Script:", PYCODE(r'''
87	87	#!/usr/bin/env python
88	88
…	…
111	111
112	112	Slide("Numeric and Sequence Types",
113		Bullet("Numeric types:", PYCON('''
	113	Bullet("Numeric types:", PYCON(r'''
114	114	>>> 5, 12345678901234567890123
115	115	(5, 12345678901234567890123L)
…	…
135	135	),
136	136
	137	Slide("File Handling and Iterables",
	138	Bullet("text2.py:", PYCODE(r'''
	139	def main(args):
	140	prog = args[0]
	141	filenames = args[1:]
	142
	143	for filename in filenames:
	144	f = open(filename, "rb")
	145
	146	try:
	147	for line in sorted(f):
	148	print line,
	149	finally:
	150	f.close()
	151
	152	with open(filename, "rb") as f:
	153	for i, line in enumerate(sorted(f)):
	154	print "%3d: %s" % (i, line),
	155
	156	with open(filename, "rU") as f:
	157	print f.read().replace("\n", r" \\ ")
	158	''')),
	159	),
	160
137	161	)
138	162

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Changeset 727

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hodgestar/Talks/PythonForProgrammers/slides/py4prog.py

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