A咖來D賽

mystring = 'ALEX'
mystring += ' hello'

vralex = mystring.lower()[2:-1]

print vralex.title()

# Result:

Ex Hell

把字元放在中間 (共要多少字元，其它用什麼補)

mystring = 'ALEX'
mystring += ' hello'

vralex = mystring.lower()[2:-1]

print vralex.center(15, '#')

# Result:

####ex hell####

計算字元

mystring = 'ALEX'
mystring += ' hello'

vralex = mystring.lower()[2:-1]

print vralex.count('l')

# Result:

2

替換字元

mystring = 'ALEX'
mystring += ' hello'

vralex = mystring.lower()[2:-1]

print vralex.replace('l', 'y')

# Result:

ex heyy

加入字元

mystring = ['to' , 'day' , 'is' , 'friday']
print ' '.join(mystring)

# Result:

to day is friday

另一個寫法

mystring = ['to' , 'day' , 'is' , 'friday']
vralex= ' '.join(mystring)

print vralex

# Result:

to day is friday

添加字元

mystring = ['to' , 'day' , 'is' , 'friday']
mystring.append('alex')

mystring.append('so')

mystring.append('cool')

print mystring

# Result:

['to', 'day', 'is', 'friday', 'alex', 'so', 'cool']

插入字元

mystring = ['to' , 'day' , 'is' , 'friday']
mystring.append('alex')

mystring.append('so')

mystring.append('cool')

mystring.insert(4, 'and')

print mystring

# Result:

['to', 'day', 'is', 'friday', 'and', 'alex', 'so', 'cool']

顯示索引

mystring = ['to' , 'day' , 'is' , 'friday']
mystring.append('alex')
mystring.append('so')

mystring.append('cool')

mystring.insert(4, 'and')

print mystring.index('and')

# Result:

4

移除字元

mystring = ['to' , 'day' , 'is' , 'friday']

mystring.append('alex')

mystring.append('so')

mystring.append('cool')

mystring.insert(4, 'and')

mystring.pop(5)

print mystring

# Result:

['to', 'day', 'is', 'friday', 'and', 'so', 'cool']

另一種寫法

mystring = ['to' , 'day' , 'is' , 'friday']
mystring.append('alex')

mystring.append('so')

mystring.append('cool')

mystring.insert(4, 'and')

mystring.pop(mystring.index('so'))

print mystring

# Result:

['to', 'day', 'is', 'friday', 'and', 'alex', 'cool']

反轉順序

mystring = ['to' , 'day' , 'is' , 'friday']
mystring.append('alex')

mystring.append('so')

mystring.append('cool')

mystring.insert(4, 'and')

mystring.pop(mystring.index('so'))

mystring.reverse()

print mystring

# Result:

['cool', 'alex', 'and', 'friday', 'is', 'day', 'to']

由小到大排列

varalex = [10, -2, 4, 6]

varalex.sort()

print varalex

# Result:

[-2, 4, 6, 10]

由大到小排列

varalex = [10, -2, 4, 6]

varalex.sort(reverse=True)

print varalex

# Result:

[10, 6, 4, -2]