一区二区二三区四区天,日韩高清不卡,亚洲伊人啪啪

Day01的課程要點記錄
詳細教程地址：金角大王 - Day1 Python基礎1 | 銀角大王 - 初始Python

一、我能學會嗎？

Can I become a great coder?
Yes - in time. The best coders go through several phases on their programming journey:

The "I know nothing" phase - 起始階段
Everything is new, nothing is easy.
The "it's starting to make sense" phase -
You're written a few programs and are making fewer mistakes.
The "I'm invincible" phase - 第三個月到第五個月
Your confindence matches your competence. No challenge seems to difficult.
The "I know nothing" phase,part II - 項目實戰(zhàn)
The sudden realization that development is infinitely more complex and you begin to doubt your own abilities.
The "I know a bit and that's OK" phase - 四、五年開發(fā)經(jīng)驗
You have decent coding skills but recognize your limitations and can find solutions to most problems (even if that means hiring another developer).

二、2與3的選擇

語法區(qū)別

#2.x
print “hello world”

#3.x
print("hello")

2.x 漢字需要聲明

#_*_coding:utf-8_*_

三、Python安裝

Windows

1、下載安裝包
    https://www.python.org/downloads/
2、安裝
    默認安裝路徑：C:\python27
3、配置環(huán)境變量
    【右鍵計算機】-->【屬性】-->【高級系統(tǒng)設置】-->【高級】-->【環(huán)境變量】-->【在第二個內(nèi)容框中找到 變量名為Path 的一行，雙擊】 --> 【Python安裝目錄追加到變值值中，用 ;分割】
    如：原來的值;C:\python27，切記前面有分號

Linux、Mac

無需安裝，原裝Python環(huán)境
ps：如果自帶2.6，請更新至2.7

四、Python入門

Hello World程序

print("Hello World!")

在Linux下運行

print("Hello World!")
print("Hello Again.")
print("hello again \ntwice") #\n 為換行

#檢查是否有可執(zhí)行權限
ll hello.py (Mac: ls -slh)
#添加可執(zhí)行權限
chmod +x hello.py #方法1
chmod 755 hello.py #方法2

#指定解釋器 - 在文件第一行添加
#!/usr/bin/python (不推薦)
#!/usr/bin/env python (推薦)

注意點

帶有引號的（‘ "），無論幾個，都代表是字符串。
命名推薦兩種方式：“MyName” or “my_name”

五、字符編碼

1.指定字符集

#!/usr/bin/env python #指定解釋器
# -*- coding: utf-8 -*- #指定字符集
 
print "你好，世界"

2.設置模版

[Settings] --> [Editor] --> [File and Code Templates] --> [Python Script]

3.注釋

單行注釋：# 被注釋內(nèi)容
多行注釋：""" 被注釋內(nèi)容 """ （三個引號，單引號雙引號均可。）

六、變量

1.聲明變量

name = "Will"

上述代碼聲明了一個變量，變量名為： name，變量name的值為："Will"

2.變量定義的規(guī)則

變量名只能是字母、數(shù)字或下劃線的任意組合
變量名的第一個字符不能是數(shù)字
以下關鍵字不能聲明為變量名
['and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'exec', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'not', 'or', 'pass', 'print', 'raise', 'return', 'try', 'while', 'with', 'yield']

3.變量的賦值

name = "Will Wang"
name2 = name #name2指向name所指向的"Will Wang"
print(name, name2) 
 
name = "Jack"  #內(nèi)存中開辟新地址保存為“Jack”
print(name, name2)
print("What is the value of name2 now?\n" + name2)

七、用戶輸入

1. 輸入用戶名

name = raw_input("Please input your name:")
print("Welcome," + name)

name = input("Please input your name:")
print("Welcome," + name)

2. 格式化字符串

name = input("Please input your name:")
age = int(input("Please input your age:")) #convert str to int
job = input("Please input your job:")
 
msg = '''
Information of user %s:
Name:   %s
Age :   %d
Job :   %s
'''%(name, name, age, job)
print(msg)

Ctrl + D 復制當前行
占位符：%s = string 字符，%d = digital 數(shù)字，%f = 小數(shù)、浮點
input 默認輸入的是字符串，數(shù)字需要用int()轉(zhuǎn)換

3. 常用模塊初識

getpass 輸入密碼

#Pycharm下不可用，僅限于Linux命令行或Windows的CMD
import getpass
username = input("username:")
password = getpass.getpass("password:")
print(username, password)

OS 調(diào)用系統(tǒng)命令

#!/usr/bin/env python
# -*- coding: utf-8 -*-
 
import os
 
os.system("df -h")  #調(diào)用系統(tǒng)命令

import os

os.system("df")
os.mkdir("yourDir")
cmd_res = os.popen("df -h").read() #讀取內(nèi)存中的顯示值并打印

4. 自己寫個模塊

python tab補全模塊

for Mac

import sys
import readline
import rlcompleter
 
if sys.platform == 'darwin' and sys.version_info[0] == 2:
    readline.parse_and_bind("bind ^I rl_complete")
else:
    readline.parse_and_bind("tab: complete")  # linux and python3 on mac
 
for mac

for Linux

#!/usr/bin/env python
# python startup file
import sys
import readline
import rlcompleter
import atexit
import os
# tab completion
readline.parse_and_bind('tab: complete')
# history file 
histfile = os.path.join(os.environ['HOME'], '.pythonhistory')
try:
    readline.read_history_file(histfile)
except IOError:
    pass
atexit.register(readline.write_history_file, histfile)
del os, histfile, readline, rlcompleter
 
for Linux

自己寫的tab.py模塊只能在當前目錄下導入，如果想在系統(tǒng)的任何一個地方都使用，要把這個tab.py放到python全局環(huán)境變量目錄里。
一般都放在一個叫Python/2.7/site-packages目錄下。
這個目錄在不同的OS里放的位置不一樣，用print(sys.path)可以查看python環(huán)境變量列表。

八、表達式if...else

1. 用戶登錄驗證

判斷用戶名和密碼

user = "will"
passwd = "wang1234"
username = input("username:")
password = input("password:")
 
if user == username:
    print("Username is correct...")
    if passwd == password:
        print("Welcome back, %s" %username)
    else:
        print("Password is not invaild...")
else:
    print("Guess it again, %s" %username)

#優(yōu)化v1
user = "will"
passwd = "wang1234"
username = input("username:")
password = input("password:")
 
if user == username and passwd == password: # 用and同時判斷username和password
    print("Welcome back, %s" %username)
else:
    print("Invalid username or password...")

2. 猜年齡

age = 31
guess_num = int(input("Please input the number you guess:"))

if guess_num == age:
    print("Congratulations! You got it!")
elif guess_num > age:
    print("Think it smaller.")
else:
    print("Think it bigger.")

九、循環(huán)

1. `for`循環(huán)

最簡單的循環(huán)10次

for i in range(10):
    print("loop:", i )

年齡游戲

age = 31
for i in range(10):
    guess_num = int(input("Please input the number you guess:"))
    if guess_num == age:
        print("Congratulations! You got it!")
        break #停止往后繼續(xù)走，跳出整個loop
    elif guess_num > age:
        print("Think it smaller.")
    else:
        print("Think it bigger.")

年齡游戲（嘗試3次）

age = 31
for i in range(10):
    if i < 3:
        guess_num = int(input("Please input the number you guess:"))
        if guess_num == age:
            print("Congratulations! You got it!")
            break #停止往后繼續(xù)走，跳出整個loop
        elif guess_num > age:
            print("Think it smaller.")
        else:
            print("Think it bigger.")
    else:
        print("You have tried too many times, good bye.")
        break

年齡游戲（每嘗試3次，詢問是否繼續(xù)）

age = 31
counter = 0 #自己的計數(shù)器
for i in range(10):
    if counter < 3:
        guess_num = int(input("Please input the number you guess:"))
        if guess_num == age:
            print("Congratulations! You got it!")
            break #停止往后繼續(xù)走，跳出整個loop
        elif guess_num > age:
            print("Think it smaller.")
        else:
            print("Think it bigger.")
    else:
        continue_confirm = input("Do you want try it again? type y to continue : ")
        if continue_confirm == "y":
            counter = 0
            continue #跳出本次循環(huán)
        else:
            print("bye")
            break
    counter += 1

2. `while`循環(huán)

年齡游戲

age = 31

count = 0
while True:
    guess_num = int(input('Please input your guees number:'))
    if guess_num == age:
        print('Yes, you got it!')
        break
    elif guess_num < age:
        print('Please think it bigger!')
    else:
        print('Please think it smaller!')

年齡游戲（嘗試3次）

age = 31

count = 0
while count < 3:
    guess_num = int(input('Please input your guess number:'))
    if guess_num == age:
        print('Yes, you got it!')
        break
    elif guess_num < age:
        print('Please think it bigger')
    else:
        print('Please think it smaller!')
    count += 1
else:
    print('You have trid too many times. Byebye')

年齡游戲（每嘗試3次，詢問是否繼續(xù)）

age = 31

count = 0
while count < 3:
    guess_num = int(input('Please input your guess number:'))
    if guess_num == age:
        print('Yes, you got it!')
        break
    elif guess_num < age:
        print('Please think it bigger')
    else:
        print('Please think it smaller!')
    count += 1
    if count == 3:
        continue_confirm = input('Do you want keep tring?')
        if continue_confirm != 'n':         # !=是不等于
            count = 0

十、作業(yè)

作業(yè)一：博客

作業(yè)二：編寫登陸接口

輸入用戶名密碼
認證成功后顯示歡迎信息
輸錯三次后鎖定

作業(yè)三：多級菜單

三級菜單
可依次選擇進入各子菜單
所需新知識點：列表、字典

流程圖：www.processon.com
Readme.md
test.md

色偷偷精品伊人,欧洲久久精品,欧美综合婷婷骚逼,国产AV主播,国产最新探花在线,九色在线视频一区,伊人大交九欧美,1769亚洲,黄色成人av

Day01 - Python基礎1

Day01 - Python基礎1

一、我能學會嗎？

二、2與3的選擇

語法區(qū)別

2.x 漢字需要聲明

三、Python安裝

四、Python入門

五、字符編碼

1.指定字符集

2.設置模版

3.注釋

六、變量

1.聲明變量

2.變量定義的規(guī)則

3.變量的賦值

七、用戶輸入

1. 輸入用戶名

2. 格式化字符串

3. 常用模塊初識

4. 自己寫個模塊

八、表達式if...else

1. 用戶登錄驗證

2. 猜年齡

九、循環(huán)

1. `for`循環(huán)

2. `while`循環(huán)

十、作業(yè)

相關閱讀更多精彩內(nèi)容

友情鏈接更多精彩內(nèi)容

色偷偷精品伊人,欧洲久久精品,欧美综合婷婷骚逼,国产AV主播,国产最新探花在线,九色在线视频一区,伊人大交九 欧美,1769亚洲,黄色成人av

Day01 - Python基礎1

一、我能學會嗎？

二、2與3的選擇

語法區(qū)別

2.x 漢字需要聲明

三、Python安裝

四、Python入門

五、字符編碼

1.指定字符集

2.設置模版

3.注釋

六、變量

1.聲明變量

2.變量定義的規(guī)則

3.變量的賦值

七、用戶輸入

1. 輸入用戶名

2. 格式化字符串

3. 常用模塊初識

4. 自己寫個模塊

八、表達式if...else

1. 用戶登錄驗證

2. 猜年齡

九、循環(huán)

1. for循環(huán)

2. while循環(huán)

十、作業(yè)

相關閱讀更多精彩內(nèi)容

友情鏈接更多精彩內(nèi)容

色偷偷精品伊人,欧洲久久精品,欧美综合婷婷骚逼,国产AV主播,国产最新探花在线,九色在线视频一区,伊人大交九欧美,1769亚洲,黄色成人av

一、我能學會嗎？

三、Python安裝

四、Python入門

九、循環(huán)

1. `for`循環(huán)

2. `while`循環(huán)

十、作業(yè)