Diferencias

Muestra las diferencias entre dos versiones de la página.

--- wiki2:python:code_notes [2016/08/14 11:53]
alfred
+++ wiki2:python:code_notes [2020/06/20 10:02] (actual)
@@ Línea 1: / Línea 1: @@
-====== Python code notes ======
+====== Python snippets ======
 ===== Getters & setters =====
 <code python>
@@ Línea 29: / Línea 29: @@
         mod = getattr(mod, comp)
     return mod
+</code>
+===== Tricks =====
+<code>
+# Different ways to test multiple
+# flags at once in Python
+x, y, z = 0, 1, 0
+if x == 1 or y == 1 or z == 1:
+    print('passed')
+if 1 in (x, y, z):
+    print('passed')
+# These only test for truthiness:
+if x or y or z:
+    print('passed')
+if any((x, y, z)):
+    print('passed')
+</code>
+===== Conditional tricks (Short circuit) =====
+You can use the conditional operators ''and'' and ''or'' for deciding how to execute code. Next piece won't print ''hola''.
+<code>
+def foo():
+    print('hola')
+False and foo()
+</code>
+===== See the low level actions =====
+We can see the low level actions of a function with the ''dis'' package:
+<code python>
+>>> def func(a):
+...     a += 10
+...     return a
+...
+>>> import dis
+>>> dis.dis(func)
+           0 LOAD_FAST                0 (a)
+LOAD_CONST               1 (10)
+INPLACE_ADD
+STORE_FAST               0 (a)
+          10 LOAD_FAST                0 (a)
+RETURN_VALUE
 </code>

Programming