.. 燕俠語錄 20241118:

成功的人是跟別人學習經驗，失敗的人只跟自己學習經驗。

--- 墨者燕俠(劉建春)

[Python] 6/49 Big Lottery 大樂透 程式, 過了今晚!

. [Python] 6/49 大樂透 程式, 過了今晚!.

.

.

import random

lotterys = random.sample(range(1,50), 7)

specialNum = lotterys.pop()

print("大樂透 中獎號碼: ", end="")

for lottery in sorted(lotterys):

    print(lottery, end=" ")

print("\n特別號: ", specialNum)

print("過了今晚!")

執行結果範例:

PS D:\DevTool\ZCode> & C:/Python312/python.exe d:/DevTool/ZCode/_Code/_Python/BigLotterys.py

大樂透 中獎號碼: 13 19 22 34 40 43 

特別號:  32

過了今晚!

[Python] 字典 dict { } 的 key, value 鍵、值 互換

.[Python] 字典 dict { } 的 key, item 鍵、值 互換

 

--- --- --- --- --- --- --- --- ---

(1) 字典鍵值互換, 方法一 for 循環:

mydict = {'a': 1, 'b': 2, 'c': 3}

mydict_new = {}

for key, value in mydict.items():

    mydict_new[value] = key

print(mydict)

print(mydict_new)

---

>>> mydict = {'a': 1, 'b': 2, 'c': 3}

>>> mydict_new = {}

>>> for key, value in mydict.items():

...      mydict_new[value] = key

...

>>> print(mydict)

{'a': 1, 'b': 2, 'c': 3}

>>> print(mydict_new)

{1: 'a', 2: 'b', 3: 'c'}

>>>

--- --- --- --- --- --- --- --- ---

(2) 字典鍵值互換, 方法二 列表生成器 generator:

mydict = {'a': 1, 'b': 2, 'c': 3}

mydict_new = dict([value, key] for key, value in mydict.items())

print(mydict)

print(mydict_new)

---

>>> mydict = {'a': 1, 'b': 2, 'c': 3}

>>> mydict_new = dict([value, key] for key, value in mydict.items())

>>> print(mydict)

{'a': 1, 'b': 2, 'c': 3}

>>> print(mydict_new)

{1: 'a', 2: 'b', 3: 'c'}

--- --- --- --- --- --- --- --- ---

(3) 字典鍵值互換, 方法三 zip:

mydict = {'a': 1, 'b': 2, 'c': 3}

mydict_new = dict(zip(mydict.values(), mydict.keys()))

print(mydict)

print(mydict_new)

---

>>> mydict = {'a': 1, 'b': 2, 'c': 3}

>>> mydict_new = dict(zip(mydict.values(), mydict.keys()))

>>> print(mydict)

{'a': 1, 'b': 2, 'c': 3}

>>> print(mydict_new)

{1: 'a', 2: 'b', 3: 'c'}

[Python] 傳回 ASCII 的 chr() 函數 vs 傳回字元的 Unicode 碼值 ord() 函數

.[Python] 傳回 ASCII 的 chr() 函數 vs 傳回字元的 Unicode 碼值 ord() 函數

(1) 傳回 ASCII 的 chr() 函數:

>>> x1 = 65

>>> x2 = 66

>>> print(chr(x1))  // 或是 print(chr(65))

A

>>> print(chr(x2))  // 或是 print(chr(66))

B

>>>

---

>>> y1 = 97

>>> y2 = 98

>>> print(chr(y1))  // 或是 print(chr(97))

a

>>> print(chr(y2))  // 或是 print(chr(98))

b

.

(2) 傳回字元的 Unicode 碼值 ord() 函數:

>>> ch11 = 'A'

>>> ch12 = 'B'

>>> print(ord(ch11))  // 或是 print(ord( 'A'))

65

>>> print(ord(ch12))  // 或是 print(ord( 'B'))

66

>>>

---

>>> ch21 = 'a'

>>> ch22 = 'b'

>>> print(ord(ch21))  // 或是 print(ord( 'a'))

97

>>> print(ord(ch22))  // 或是 print(ord( 'b'))

98

[Python] name_list.reverse() and name_list[::-1]

. 

(1) 方法1: name_list.reverse()

(2) 方法2: 使用 slice 切片 name_list[::-1]

.

# Example 1:

python3

>>>

>>> cars = ['Honda', 'BMW', 'Toyota', 'Ford']

>>> cars

['Honda', 'BMW', 'Toyota', 'Ford']

>>> cars[::-1]

['BMW', 'Ford', 'Toyota', 'BMW', 'Honda']

>>> cars.reverse()

>>> cars

['Ford', 'Toyota', 'BMW', 'Honda']

.

.

# Example 2:

>>> nums1 = [5, 3, 9, 2]

>>> nums1

[5, 3, 9, 2]

>>> nums2 = nums1[::-1]

>>> nums2

[2, 9, 3, 5]

>>> nums1.reverse()

>>> nums1

[2, 9, 3, 5]

.