# [python]python簡易筆記
###### tags: `Python`

## 網路教學

再見了 pip！最佳 Python 套件管理器——Poetry 完全入門指南
https://blog.kyomind.tw/python-poetry/

## Dictionary

### check key/value exists in dictionary
https://stackoverflow.com/questions/8214932/how-to-check-if-a-value-exists-in-a-dictionary-python

d = {
     'a':111,
     'b':222,
     'c':333
     }

k = 'a'
v = 555

print(k in d.keys())  #=>True
print(v in d.values())  #=>False

## 字串

### 數字轉字串

num = 1
output = '0' + str(num)

print(output) #=> 01

## 使用者輸入

### 偵測鍵盤輸入
https://stackoverflow.com/questions/24072790/detect-key-press-in-python

import keyboard

while True:
    if keyboard.read_key() == "p":
        print("You pressed p")
        break

### 按esc退出
https://stackoverflow.com/questions/50733662/how-to-continue-or-exit-the-program-by-pressing-keys

import sys
import keyboard
a=[1,2,3,4]
print("Press Enter to continue or press Esc to exit: ")
while True:
    try:
        if keyboard.is_pressed('ENTER'):
            print("you pressed Enter, so printing the list..")
            print(a)
            break
        if keyboard.is_pressed('Esc'):
            print("\nyou pressed Esc, so exiting...")
            sys.exit(0)
    except:
        break

## file I/O

### 檢查文字檔案是否為空白
https://stackoverflow.com/questions/2507808/how-to-check-whether-a-file-is-empty-or-not

def is_file_empty(file):
    content = open(file,"r",encoding='UTF-8-sig').read()
    import re
    if re.search(r'^\s*$', content):
        return True

## 編譯

### 將專案打包成可執行檔(.exe)
https://medium.com/pyladies-taiwan/python-%E5%B0%87python%E6%89%93%E5%8C%85%E6%88%90exe%E6%AA%94-32a4bacbe351

pyinstaller -F .\ur_file_name.py