#format的第一個用法
#1.1普通的功能
msg = '大家好我叫{}，今年{}歲'
print(msg.format('阿衰',20))#大家好我叫阿衰，今年20歲
#1.2按照括號中的數字大小進行賦值，從0開始
msg = '大家好我叫{1}，今年{0}歲,明年{0}歲'
print(msg.format('阿衰',20))#大家好我叫20，今年阿衰歲,明年阿衰歲
#1.3關鍵值取值
msg = '大家好我叫{name}，今年{age}歲,明年{age}歲'
print(msg.format(age=20,name='20'))#大家好我叫20，今年20歲,明年20歲
#1.4填充和格式化
print('我叫{:*^5},我今年{:>4}歲了'.format('三',20))#我叫**三**,我今年  20歲了

#2.字串的判斷
a ='asdsadsad'
b ='SADSDSFDF'
#2.1 upper全部轉換成大寫
print(a.upper())#ASDSADSAD
#2.2 lower全部轉換成小寫
print(b.lower())#sadsdsfdf
#2.3 swapcase把大小寫全部互換
print(a.swapcase())#ASDSADSAD
#2.4 title將字串符當中的單詞首字母大寫，單詞以非字母劃分
c = 'i love you too'
print(c.title())#I Love You Too
#2.5capitalize只有字串的首字母大寫
print(c.capitalize())#I love you too
#2.6 expandtabs
s='hello\tpython'
print(s.expandtabs())#hello   python