# Python Array 追加削除結合
| メソッド | 説明 |
|---|---|
array.append(x) | 末尾に追加 |
array.count(x) | 指定要素が配列含む回数 |
array.remove(x) | 指定要素を配列から削除 |
array.reverse() | 配列順番逆転 |
array.tolist() | 配列をリストに変換 |
array.insert(index, x) | 配列 index の前に挿入 |
配列 for 文
row = 5
for i in range(row):
for j in range(row+i):
if(j < row - i - 1):
print(' ', end='')
else:
print('*', end='')
print()
# *
# ***
# *****
# *******
#*********
配列基本操作
numbers = [1,2,3]
numbers += [4,5,6] # 配列追加
print(numbers[1:3]) # [2, 3]
print(numbers[:]) # [1, 2, 3, 4, 5, 6]
print(numbers[-3:-1]) # [4, 5]
print(numbers[::-1]) # [6, 5, 4, 3, 2, 1]
list1 = ['a','b','c','d','e']
list2 = sorted(list1)
list3 = sorted(list1, reverse=True)
list4 = sorted(list1, key=len)
print(list1) # ['a', 'b', 'c', 'd', 'e']
print(list2) # ['a', 'b', 'c', 'd', 'e']
print(list3) # ['e', 'd', 'c', 'b', 'a']
print(list4) # ['a', 'b', 'c', 'd', 'e']
list1.sort(reverse=True)
print(list1) # ['e', 'd', 'c', 'b', 'a']
Python で流れる文字アニメーション作成できる
import os
import time
def main():
content = 'Pythonで流れ文字作れる～～～'
while True:
os.system('cls') # os.system('clear')
print(content)
time.sleep(0.2)
content = content[1:] + content[0]
if __name__ == '__main__':
main()
# オブジェクト & 連想配列 加工処理
fruits = {
'apple': 100,
'orange': 50,
'strawberry': 90,
'avocado': 200,
'raspberry': 240,
'grapefruit': 110,
'coconut': 500,
'cherry': 1000,
'pineapple': 300,
'banana': 120,
'durian': 2000,
'peach': 120,
}
# 500円以上集合
fruits2 = {key: value for key, value in fruits.items() if value > 500}
print(fruits2) # {'cherry': 1000, 'durian': 2000}
fruits = ['apple', 'orange', 'banana']
level = ['普通', '高級']
prices = [[None] * len(level) for _ in range(len(fruits))]
print(prices)
# [[None, None], [None, None], [None, None]]
配列ソート
def quick_sort(items, comp=lambda x, y: x <= y):
items = list(items)[:]
_quick_sort(items, 0, len(items) - 1, comp)
return items
def _quick_sort(items, start, end, comp):
if start < end:
pos = _partition(items, start, end, comp)
_quick_sort(items, start, pos - 1, comp)
_quick_sort(items, pos + 1, end, comp)
def _partition(items, start, end, comp):
pivot = items[end]
i = start - 1
for j in range(start, end):
if comp(items[j], pivot):
i += 1
items[i], items[j] = items[j], items[i]
items[i + 1], items[end] = items[end], items[i + 1]
return i + 1
配列 map filter
items1 = list(map(lambda x: x ** 2, filter(lambda x: x % 2, range(1, 10))))
items2 = [x ** 2 for x in range(1, 10) if x % 2]
2021-01-22