Add list and del statement.

Author: hermite2053

data_structures/del/del.py

@@ -0,0 +1,4 @@
+n = 100
+print(n)
+del n
+# print(n) # NameError

data_structures/list_type/comprehensions.py

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+cubes = []
+for i in range(20):
+    cubes.append(i ** 3)
+
+print(cubes)

data_structures/list_type/list_method.py

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+colors = ['red', 'green', 'black', 'cyan']
+
+print(colors) # just print the list...
+
+# add an item to the end of the list.
+colors.append('green')
+print(colors)
+
+# add all of elements of iterable to the end of the list.
+colors.extend(['orange', 'white'])
+print(colors)
+
+# insert an item to the specified position of the list.
+colors.insert(2, 'blue')
+print(colors)
+
+# remove the first item that is equal to the given item.
+colors.remove('cyan')
+print(colors)
+
+# delete the item given position from the list and return deleted item.
+print(colors.pop(5))
+print(colors)
+
+# return the first position whose value equals given item.
+print(colors.index('black'))
+
+# return the number of given item appears in the list.
+print(colors.count('green'))
+print(colors.count('lapis lazuli'))
+
+# sort the list
+colors.sort()
+print(colors)
+
+# reverse the items
+colors.reverse()
+print(colors)
+
+# return a shallow copy of the list
+copy = colors.copy()
+print(copy)
+
+# clear all of items in the list.
+colors.clear() # eqivalent to `del colors[:]`.
+print(colors)

data_structures/list_type/queue.py

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+# collections: Container Datatypes
+# deque -- double-ended queue
+from collections import deque
+
+queue = deque(['beta','gamma', 'delta'])
+print(queue)
+
+queue.append('epsilon')
+print(queue)
+
+queue.appendleft('alpha')
+print(queue)
+
+queue.pop()
+print(queue)
+
+queue.popleft()
+print(queue)
+

data_structures/list_type/stack.py

@@ -0,0 +1,16 @@
+stack = [10, 20, 30] # 10, 20, 30
+stack.append(40) # 10, 20, 30, 40
+stack.append(50) # 10, 20, 30, 40, 50
+
+print(stack)
+
+a = stack.pop()
+print(a)
+
+a = stack.pop()
+print(a)
+
+a = stack.pop()
+print(a)
+
+print(stack)