python之路：第一周笔记

###python中默认所有的输入为string类型
###python中代码实行强制缩进，缩进错误代码：IndenttationError
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第1周-----用户交互、if判断、while循环、for循环
       if else 流程判断
          if 变量 = 变量 and 变量 = 变量 ：
             print（"xxxx"）.format(变量)
          else:
             print（"xxxx"）.format(变量)

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1.continue 用法：跳出本次循环，继续到下一次循环。
if i < 3:
    print("loop",i)
else:
    continue #当i>=3 则执行此处，跳出本次循环，回到for 执行下一次循环
print("hehe")

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 2.循环套循环：大循环套小循环，break用法：break结束当前循环。
for i in range(0,10):
    print("-----",i)
    for j in range(10):
        print(j)
        if j>5:
            break


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3.'''xxx '''' 三个单引号的作用：
1.注释   2. 打印多行

      

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4.用户输入
变量 = input（“xxx‘’）
print(变量）
#Author:andxu
username = input("please enter username:")
password = input("please enter password:")
age = input("please enter age:")
sex = input("please enter sex:")
print(username,password)

#outcome
please enter username:151
please enter password:1651
please enter age:5616
please enter sex:15

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5.字符串拼接 
           第一种：'''  '''  三引号 + 拼接
           第二种：

       56

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第一种code：
#Author:andxu
username = input("please enter username:")
password = input("please enter password:")
age = input("please enter age:")
sex = input("please enter sex:")
#print(username,password)
info = '''
------ info of ''' + username + ''' ------
Name:''' + username + '''
Password:''' +password + '''
age：''' + age + '''
sex: ''' + sex + '''
'''
print(info)

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第二种code： （s代表string，一个字符类型。d代表只能接受数字，帮助检测验证数据类型。f代表浮点小数。）
#Author:andxu
username = input("please enter username:")
password = input("please enter password:")
age = input("please enter age:")
sex = input("please enter sex:")
#print(username,password)
info = '''
------ info of %s ------
Name:%s
Password:%s
age：%s
sex: %s'
''' %(username,username,password,age,sex)
print(info)

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第三种code：用format函数
#Author:andxu
username = input("please enter username:")
password = input("please enter password:")
age = input("please enter age:")
sex = input("please enter sex:")
#print(username,password)
info1 = '''
------ info of {_username} ------
Name:{_username}
Password:{_password}
age：{_age}
sex: {_sex}
''' .format(_username = username,
            _password = password,
            _age = age,
            _sex = sex)
print(info1)

#Author:andxu
username = input("please enter username:")
password = input("please enter password:")
age = input("please enter age:")
sex = input("please enter sex:")
#print(username,password)
info2 = '''
------ info of {0} ------
Name:{0}
Password:{1}
age：{2}
sex: {3}
''' .format(username,username,password,age,sex)
print(info2)

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6.打印一个数据的变量类型：
print(type(age))
4.转换数据类型
age = int(input("age:"))
print(type(age),type(str(age)))

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7.明文变密文
#Author:andxu
import getpass #导入引用原有模块变量
username = input("username:")
password = getpass.getpass("password:")

print(username,password)
此操作只能在命令提示符cmd命令窗口内
  

     

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8.while 循环
count = 0
while True:
    print("count:")
    count = count +1   #count +=

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9.#python小游戏：
猜年龄
#Author:Andxu

age_of_xusj = 23
guess_age = int(input("guess age:"))
if guess_age == age_of_xusj:
    print("yes,you got it!")
elif guess_age > age_of_xusj:
    print("guess smaller!")
else:
    print("guess bigger!")

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循环猜年龄
#Author:Andxu

age_of_xusj = 23
#count = 3
while True:
    guess_age = int(input("guess age:"))
    if guess_age == age_of_xusj:
        print("yes,you got it!")
    elif guess_age > age_of_xusj:
        print("guess smaller!")
    else:
        print("guess bigger!")

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循环猜年龄，猜对退出 break函数
#Author:Andxu

age_of_xusj = 23
#count = 3
while True:
    guess_age = int(input("guess age:"))
    if guess_age == age_of_xusj:
        print("yes,you got it!")
        break
    elif guess_age > age_of_xusj:
        print("guess smaller!")
    else:
        print("guess bigger!")

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循环猜年龄，限制次数退出。
#Author:Andxu 

age_of_xusj = 23
count = 0  #计数器
while True:  #为真，当条件成立
    if count ==3:
        break  #破坏本次循环，直接退出！
    guess_age = int(input("guess age:"))
    if guess_age == age_of_xusj:
        print("yes,you got it!")
        break  #破坏本次循环，直接退出！
    elif guess_age > age_of_xusj:
        print("guess smaller!")
    else:
        print("guess bigger!")
    count = count +1 #次数自增1

优化：
#Author:Andxu

age_of_xusj = 23
count = 0  #计数器
while  count <3:  #当count小于3 为真，执行以下循环
    guess_age = int(input("guess age:"))
    if guess_age == age_of_xusj:
        print("yes,you got it!")
        break  #破坏本次循环，直接退出！
    elif guess_age > age_of_xusj:
        print("guess smaller!")
    else:
        print("guess bigger!")
    count +=1 #次数自增1

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猜年龄输入3次错误提示：
#Author:Andxu

age_of_xusj = 23
count = 0  #计数器
while  count <3:  #当count小于3 为真，执行以下循环
    guess_age = int(input("guess age:"))
    if guess_age == age_of_xusj:
        print("yes,you got it!")
        break  #破坏本次循环，直接退出！
    elif guess_age > age_of_xusj:
        print("guess smaller!")
    else:
        print("guess bigger!")
    count +=1 #次数自增1
if count ==3: #当次数等于3执行以下print提示
    print("you have tried too many times.. you fuck off")

猜年龄：猜错三次询问继续否
#Author:Andxu

age_of_xusj = 23
count = 0  #计数器
while  count <3:  #当count小于3 为真，执行以下循环
    guess_age = int(input("guess age:"))
    if guess_age == age_of_xusj:
        print("yes,you got it!")
        break  #破坏本次循环，直接退出！
    elif guess_age > age_of_xusj:
        print("guess smaller!")
    else:
        print("guess bigger!")
    count +=1 #次数自增1
    if count == 3:
        countine_confirm = input("do you want to keep guessing ? : ")
        if countine_confirm != 'n':
            count = 0

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10.for 循环
for i in  range(10): #range 相当于一个变量数据集（0，1，2，3，4，5，6，7，8，9）
    print("loop",i)

result：
F:CXYYpython3.2venvScriptspython.exe F:/CXYY/python3.2/for.py
loop 0
loop 1
loop 2
loop 3
loop 4
loop 5
loop 6
loop 7
loop 8
loop 9

进程已结束,退出代码0

for 循环 跳数打印：
 # (0,10,2)表示从0到10，2表示步长，默认为1，即range（0,10）= range（0,10,1）

for i in  range(0,10,2): #range 相当于变量数据集（0，1，2，3，4，5，6，7，8，9）
    print("loop",i)

result：

for用于猜年龄游戏
#Author:Andxu

age_of_xusj = 23
for i in range(3):  #当count小于3 为真，执行以下循环
    guess_age = int(input("guess age:"))
    if guess_age == age_of_xusj:
        print("yes,you got it!")
        break  #破坏本次循环，直接退出！
    elif guess_age > age_of_xusj:
        print("guess smaller!")
    else:
        print("guess bigger!")
else:
    print("you have tried too many times.. you fuck off")

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                                                              date：20180703 xsj