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Jure Šorn 7 years ago
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      README.md

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README.md

@ -1,4 +1,4 @@
Python and Libraries Cheatsheet Comprehensive Python Cheatsheet
=============================== ===============================
Main Main
@ -20,6 +20,11 @@ sum(<list>)
sorted_by_second = sorted(<list>, key=lambda tup: tup[1]) sorted_by_second = sorted(<list>, key=lambda tup: tup[1])
``` ```
Flatten List
```
[item for sublist in list for item in sublist]
```
Dictionary Dictionary
---------- ----------
```python ```python
@ -35,6 +40,11 @@ Init from two lists
dict(zip(keys, values)) dict(zip(keys, values))
``` ```
Filter by keys
```
{k: v for k, v in d.iteritems() if k in [2,3]}
```
Counter Counter
``` ```
>>> from collections import Counter >>> from collections import Counter
@ -52,7 +62,7 @@ Set
<set>.union(<set>) <set>.union(<set>)
<set>.intersection(<set>) <set>.intersection(<set>)
<set>.difference(<set>) <set>.difference(<set>)
<frozenset> - is hashable can be used as key in dictionary <frozenset> - Is hashable and can be used as key in dictionary
``` ```
Range Range
@ -514,14 +524,13 @@ islice([1, 2, 3], 1, None)
[2, 3] [2, 3]
``` ```
### Ifilter/imap/izip
### ifilter/imap/izip
Filter, map and zip functions that return generators instead of iterators Filter, map and zip functions that return generators instead of iterators
Introspection and Metaprograming Introspection and Metaprograming
-------------------------------- --------------------------------
Inspecting code at runetime and code that generates code. Inspecting code at runtime and code that generates code.
```python ```python
>>> class B: >>> class B:
@ -566,6 +575,7 @@ BB = type('B', (), {'a': 'sdfsd', 'b': 123324}
b = BB() b = BB()
``` ```
MetaClass MetaClass
--------- ---------
Classes that creates classes. Classes that creates classes.
@ -582,6 +592,7 @@ class MyMetaClass(type):
return type.__new__(klass, name, parents, attrs) return type.__new__(klass, name, parents, attrs)
``` ```
Do Stuff Do Stuff
-------- --------
* Look at the attributes * Look at the attributes
@ -590,6 +601,7 @@ Do Stuff
* Traverse the parent classes * Traverse the parent classes
* Change values in the class * Change values in the class
Metaclass Attr Metaclass Attr
-------------- --------------
When class is created it checks if it has metaclass defined. If not, it recursively checks if any of his parents has it defined, and eventually comes to type. When class is created it checks if it has metaclass defined. If not, it recursively checks if any of his parents has it defined, and eventually comes to type.
@ -598,6 +610,7 @@ class BlaBla:
__metaclass__ = Bla __metaclass__ = Bla
``` ```
Eval Eval
---- ----
``` ```
@ -633,20 +646,6 @@ def eval_(node):
``` ```
Ascii
-----
Get char from int.
```
chr(<int>)
```
Flatten List
------------
```
[item for sublist in a_list for item in sublist]
```
Libraries Libraries
========= =========
@ -691,7 +690,10 @@ def draw(screen):
pass pass
``` ```
Get char from int
```
chr(<int>)
```
Profile Profile
------- -------
@ -718,7 +720,7 @@ def get_datetime_string(a_datetime):
Audio Audio
----- -----
Saves list of floats of size 0 to 1 to a wav file. Saves list of floats of size 0 to 1 to a WAV file.
``` ```
import wave import wave
import struct import struct
@ -731,16 +733,6 @@ wf.writeframes(b''.join(frames))
wf.close() wf.close()
``` ```
Coockboock
==========
Dictionary
----------
Filter by keys:
```
{k: v for k, v in d.iteritems() if k in [2,3]}
```

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