Python下載

官網下Python3，安裝好後新增一下環境變數就可以了

cmd中輸入 path=%path%;C:\Python (C:\Python是Python的安裝路徑)

在cmd中輸入 python -V檢視python版本，如果可以說明安裝成功

Hello World

輸出"Hello World!"，程式碼為print(“Hello World!”)

一：cmd命令提示符

1. 輸入python進入互動介面
2. 輸入程式碼 print(“Hello World!”)
3. 按 ctrl+Z退出
   

二：執行py指令碼

1. 新建txt檔案，記事本開啟
2. 輸入程式碼 print(“Hello World!”)，儲存推出，字尾改成 .py
3. 在檔案所在資料夾sheft+右鍵，選擇cmd/powershell，輸入python，再輸入檔名
4. 第三步也可以直接win+Q，查詢cmd開啟，輸入python，再輸入檔案的路徑（直接拖過去也行）
   

IDE下載

PyCharm下載： https://www.jetbrains.com/pycharm/download/

安裝介面： 路徑任意，勾選下面三個

Active：

找到C:\Windows\System32\drivers\etc\hosts，用記事本開啟，在檔案的最後一行的下一行，輸入 0.0.0.0 account.jetbrains.com

回到PyCharm中選擇Activation code，輸入以下程式碼即可

K71U8DBPNE-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-Owt3/+LdCpedvF0eQ8635yYt0+ZLtCfIHOKzSrx5hBtbKGYRPFDrdgQAK6lJjexl2emLBcUq729K1+ukY9Js0nx1NH09l9Rw4c7k9wUksLl6RWx7Hcdcma1AHolfSp79NynSMZzQQLFohNyjD+dXfXM5GYd2OTHya0zYjTNMmAJuuRsapJMP9F1z7UTpMpLMxS/JaCWdyX6qIs+funJdPF7bjzYAQBvtbz+6SANBgN36gG1B2xHhccTn6WE8vagwwSNuM70egpahcTktoHxI7uS1JGN9gKAr6nbp+8DbFz3a2wd+XoF3nSJb/d2f/6zJR8yJF8AOyb30kwg3zf5cWw==-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

PyCharm上手

1. Create New Project
2. Location選擇一個project的路徑（可能彈出Error: Standard Python ‘venv’ module not found，屬於Python版本的問題，不用管）
3. File->Settings->Project:xxx->Interpreter，<No …>改成你的Python即可
   
   
4. 在Project中右鍵，New->Python File，就可以在新建的py檔案中愉快的敲程式碼了
   
5. 按shift+ctrl+ $F_{10}$，在下面的run視窗中進行輸入輸出

程式示範

print("Hello\n")

for i in range(1,5):
    print(i,end=",")
    print(i+1)
print("next is ",end=": ");print(2);print()

a="12"
a+=('12')
print(a,end="\n\n")
a = 10
a+=12
print(a)

b='''


'''
print("st->"+b+'<-en' ,end='。')

Output：

Hello

1,2
2,3
3,4
4,5
next is : 2

1212

22
st->


<-en。

學C/C++後學Java感覺差別不大，但是Python看上去卻很不一樣，但是如果學過C的話，入門只需要最多三小時

縮排問題

Python 的程式碼塊不使用大括號 {} 來控制：類，函式以及其他邏輯判斷。而是使用相同的縮排來表示一塊程式碼塊

同一塊程式碼的縮排必須相同，一個空格都不能錯。且開頭塊前不能有空格

if True:
    print(1)
    print(2)
    if True:
         print(3)
    print(4)
else:
    print(5)

相當於：

if (True){
    print(1)
    print(2)
    if (True){
         print(3)
    }
    print(4)
}
else{
    print(5)
}

Output：

1
2
3
4

行問題

一行程式碼可能很長，其他語言中直接換行即可，但是Python卻以新行作為語句的結束符。如果需要一行寫成多行程式碼，在程式碼後面加 '\'即可

自帶{},[],()的程式碼可以不需要

print(\
   2+3)
   
a=["aaa",
   11]
print(a)