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Add context manger / 'with' statement to tutorial

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John Jacobsen 2013-04-21 09:03:19 -05:00
parent 3f362bc318
commit 499ec7697c
1 changed files with 14 additions and 1 deletions
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docs/tutorial.rst
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@ -324,6 +324,18 @@ Comments start with semicolons:
; (print "but this will not") ; (print "but this will not")
(+ 1 2 3) ; we'll execute the addition, but not this comment! (+ 1 2 3) ; we'll execute the addition, but not this comment!
Python's context managers ('with' statements) are used like this:
.. code-block:: clj
(with [f (file "/tmp/data.in")]
(print (.read f)))
which is equivalent to::
with file("/tmp/data.in") as f:
print f.read()
And yes, we do have lisp comprehensions! In Python you might do:: And yes, we do have lisp comprehensions! In Python you might do::
odds_squared = [ odds_squared = [
@ -363,7 +375,7 @@ In hy, you could do these like:
; (8, 'A'), (8, 'B'), (8, 'C'), (8, 'D'), (8, 'E'), (8, 'F'), (8, 'G'), (8, 'H')] ; (8, 'A'), (8, 'B'), (8, 'C'), (8, 'D'), (8, 'E'), (8, 'F'), (8, 'G'), (8, 'H')]
Protips! Protips!
======== ========
@ -409,6 +421,7 @@ TODO
==== ====
- How do I define classes? - How do I define classes?
- How do I use context managers?
- Blow your mind with macros! - Blow your mind with macros!
- Where's my banana??? - Where's my banana???
- Mention that you can import .hy files in .py files and vice versa! - Mention that you can import .hy files in .py files and vice versa!