Python Code Statement / Comment Method
dict
default foreach
Code



a_dict = {'color': 'blue', 'fruit': 'apple', 'pet': 'dog'}
for key in a_dict:
    print(key)

output


color
fruit
pet
foreach .items()
Code


a_dict = {'color': 'blue', 'fruit': 'apple', 'pet': 'dog'}
for key in a_dict.items():
    print(key)
output


('color', 'blue')
('fruit', 'apple')
('pet', 'dog')
Code

for key, value in a_dict.items():
    print(key, '->', value)
Output


color -> blue
fruit -> apple
pet -> dog
datatime
String(ISO8601) to Datetime
lAt: datetime = dateutil.parser.parse("2019-09-07T-15:50+00") 
datetime to ISO8601 String

time=datetime.now()
time.isoformat()
JSON
Json String to dict
qobj = json.loads(jstr)
dict to JSON String
jstr = json.dumps(dictObj)
escape unescape
url





import urllib.parse
逃脫後的文字=urllib.parse.quote(jstr)

原文=urllib.parse.unquote(逃脫後的文字)
特殊寫法
range()












for i in range(5):
    print(i)
# out put 0~4

list(range(5))
# [0, 1, 2, 3, 4]
range(1, 11)     # 从 1 开始到 11

range(0, 30, 5)  # 步长为 5
# 0, 5, 10, 15, 20, 25]

range(0, -10, -1) # 负数
# [0, -1, -2, -3, -4, -5, -6, -7, -8, -9]
List
用 * 重複多個




















title = ["H"]*3
# ['H','H','H']

names = ["Andy","Peter","Kirin","Tony"]
print(names[-1]) # 取用最後一個 Tony

print(names[1:3]) # 去第1位 第2位 不包含 3  Peter  Kirin

print(names[0:3]) # 去第0位到第2位 不包含 3 Andy Peter  Kirin

print(names[2:]) # 2位 到最後   Kirin Tony

print(names[:]) # 通常用於複製

print(names[::3]) # [0,3,6,9]

numbers = list(range(10))
hiNums = [ 'HI:'+ str(n) for n in numbers ]
print(hiNums)
# ['HI:0', 'HI:1', 'HI:2', 'HI:3', 'HI:4', 'HI:5', 'HI:6', 'HI:7', 'HI:8', 'HI:9']

tags: python

Kirin Note