Python中字符串相关的处理

string_handle.py

a = 'Life is short, you need Python'
a.lower()              	# 'life is short, you need Python'
a.upper()               	# 'LIFE IS SHORT, YOU NEED PYTHON'
a.count('i')            	# 2
a.find('e')             	# 从左向右查找'e'，3
a.rfind('need')         	# 从右向左查找'need'，19
a.replace('you', 'I')   # 'Life is short, I need Python'
tokens = a.split()    	# ['Life', 'is', 'short,', 'you', 'need', 'Python']
b = ' '.join(tokens)	# 用指定分隔符按顺序把字符串列表组合成新字符串
c = a + '\n'            	# 加了换行符，注意+用法是字符串作为序列的用法
c.rstrip()              	# 右侧去除换行符
[x for x in a]          	# 遍历每个字符并生成由所有字符按顺序构成的列表
'Python' in a   			# True