For
xs = [8, 23, 45]
for x in xs:
print("item #{} = {}".format(index, x))
Use the built-in function enumerate():
for idx, x in enumerate(xs):
print(idx, x)
Data structure
List
l = []
# or
l = list()
# add
l.append(1)
print(l) # 1
# for loop
>>> for i, value in enumerate(['A', 'B', 'C']):
... print(i, value)
...
0 A
1 B
2 C
Ref https://swsmile.info/post/python-collection-list/
Map/Dict
# init
thisdict = {
"brand": "Ford",
"model": "Mustang",
"year": 1964
}
print(type(thisdict))
# init 2
thisdict = dict(name = "John", age = 36, country = "Norway")
print(thisdict)
# delete
del tel['sape']
# dict -> list
>>> tel
{'jack': 4098, 'guido': 4127, 'irv': 4127}
>>> list(tel)
['jack', 'guido', 'irv']
# get
>>> 'Thomas' in d
False
# for-loop
>>> d = {'a': 1, 'b': 2, 'c': 3}
>>> for key in d:
... print(key)
...
a
c
b
>>> knights = {'gallahad': 'the pure', 'robin': 'the brave'}
>>> for k, v in knights.items():
... print(k, v)
...
gallahad the pure
robin the brave
Ref https://swsmile.info/post/python-collection-dict/
Set
thisset = {"apple", "banana", "cherry"}
print(thisset)
thisset = set(("apple", "banana", "cherry")) # note the double round-brackets
print(thisset)
// add
GEEK.add('s')
Ref https://swsmile.info/post/python-collection-set/
Tuple
thistuple = ("apple", "banana", "cherry")
print(thistuple)
thistuple = tuple(("apple", "banana", "cherry")) # note the double round-brackets
print(thistuple)
s=(2,5,8)
s_append = s + (8, 16, 67)
print(s_append) # (2, 5, 8, 8, 16, 67)
print(s) # (2, 5, 8)
a = ('2',)
b = 'z'
new = a + (b,)
Ref https://swsmile.info/post/python-collection-tuple/