>>> len(s) # 字串長度
4
>>> s[0]
'H'
>>> s[1]
'a'
>>> s[-1]
'k'
>>> s
'Hank'
>>> s[1:3]
'an'
>>> s[:3]
'Han'
>>> s[:-1]
'Han'
>>> s + ' Wang'
'Hank Wang'
>>> s
'Hank'
>>> s*5
'HankHankHankHankHank'
>>> s[0] = 'z' # 不得指定變更字串
TypeError: 'str' object does not support item assignment
>>> s = 'z' + s[1:] # 產生新物件
>>> s
'zank'
>>> s.find('an')
1
>>> s.replace('an', 'zz')
'zzzk'
>>> line = 'a,b,c,d'
>>> line.split(',')
['a', 'b', 'c', 'd']
>>> s.upper()
'ZANK'
>>> s.isalpha()
True
>>> s.isdigit()
False
>>> a = '2'
>>> a.isdigit()
True
>>> s = 'aaa,bbb '
>>> s.rstrip() # 移除右側空白字元
'aaa,bbb'
查看某函式的用途：
>>> help(s.strip)
Help on built-in function strip:
strip(...)
S.strip([chars]) -> string or unicode
Return a copy of the string S with leading and trailing
whitespace removed.
If chars is given and not None, remove characters in chars instead.
If chars is unicode, S will be converted to unicode before stripping
>>> msg = """ aaabbbccc'''""
abcdeff"""
>>> msg
' aaabbbccc\'\'\'""\nabcdeff'
Reference:
string — Common string operations
Learning Python, 3e
