Bearbeiten von „Python“

[[Kategorie:Sprache]]
= Datentypen =
* List: ['a', 1]; x[1] = 5
* Tupel: ('a', 1), ro

== Dictionary==
<pre>
x = { 'key' : 'val', 'xyz': 3 }
x['key'] = value
del x['key'];
contains = 'key' in x and 'key2' not in x
size = len(x)
for pair in x.iteritems():
  key = pair[0]
for key in x.iterkeys():
  print key
</pre>
* x.itervalues()
* x.setdefault(key[, value]): setzt Wert nur, wenn noch nicht gesetzt
* x.keys(), x.values()
* x.copy(): flache Kopie
* x.update(dict): addiert dict zu x

== Mengen ==
<pre>
s = set(['y', 3]) ; f = frozenset(['y', 3]) 
for elem in s:
  print elem
size = len(s)
contains = 3 in s and 4 not in s
intersection = s & f
union = s | f
isPartOf = s <= f
diff = s - f
</pre>

== Dateien ==
<pre>
with open(self._filename, "r") as fp:
  for line in fp:
     print line
fp.close()
</pre>