python 入門 《第一篇》

# 變量分爲2種

# 單行註釋

"""多行註釋"""

# 存一箇中文 需要3個字節

# ASCII 只能255  1bytes  -->  1980 gb2312 只支持7000多個文字  -->  1995 GBK1.0 支持2w+
#         --> 2000 GB18030  27000  -->   unicode  2bytes   -->  utf-8  en:1bytes  zh:3bytes



# 定義常量通常使用 大寫

PIE =12;

gf_of_oldboy = "";
GFOfOldboy = "";

print(2**8);

 

註釋學習

name = "你好， 世界";


msg = '''
打印多行
打印多行
打印多行
''';

print(msg);

input 用戶交互學習：

# username = input("what is name: ");
#
# print("name :"+ username);



#  字符串的組裝 %s 字符串  %d 只接受數字   %f 浮點(小數)
name = input("name:");
age = int(input("age:"));  # 轉化類型 將 string 轉爲 integer
# print(type(str(age)));

#
info = '''
--- info of  %s  -------
name: %s
age: %d
'''%(name, name, age)
# print(info);


# ---------------------------使用這種字符串拼接-------------------
info2 = '''
--- info of {_name}  -------
name: {_name}
age: {_age}
'''.format(_name=name,
           _age=age);
# print(info2);

# --------------------------------------------------------------------

info3 = '''
--- info of  {0}  -------
name: {0}
age: {1}
'''.format(name,age);
print(info3);

if else  學習

# 引入模塊（標準庫，只要import）
import getpass

_username = 'alex';
_password = '123';

username = input("username:")
password = input("password:")

# password = getpass.getpass("password:")
# print(username, password)

# 流程控制，邏輯運算()
if _username == username and _password == password:
    # 下面這段是上面這段子代碼
    print("Welcome user {name} login..".format(name=username))
else:
    # 下面這段是上面這段子代碼
    print("Invalid username or password !")

 # print('ddd');
print('ddd');
# ##################### IndentationError(縮進錯誤)
#  print('ddd'); 必須頂格寫，不能留有空隙，否則報縮進錯誤

while 循環：

# 猜年齡 (循環)

'''
age_of_boy = 56

count =0
while count <3:
    guess_age = int(input("guess age:"))
    if guess_age == age_of_boy:
        print("yes, you got it.")
        break;
    elif guess_age > age_of_boy:
        print("think smaller..")
    else:
        print("think bigger!")
    count += 1
else:
    print("you have tried too many times .. fuck off")
'''

# while 循環 優化版本

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

'''
age_of_boy=56
count = 0
for i in range(3):
    guess_age = int(input("guess age:"))
    if guess_age == age_of_boy:
        print("yes, you got it.")
        break;
    elif guess_age > age_of_boy:
        print("think smaller..")
    else:
        print("think bigger!")
else:
    print("you have tried too many times .. fuck off")
    
 '''

# 跳着打印  3 格2個跳一次（補償）默認爲1
# for i in range(0,10,3):
#     print("loop:" ,i)

# break  跳出循環  continue
'''

for i in range(0,10):
    if i < 3:
        print("loop:", i)
    else:
        continue  # 跳出 本次循環,進入下次循環
    print("------呵呵呵呵------")
'''

for i in range(10):
    print("-------------", i)
    for j in range(10):
        print(j)
        if j >5:
            break