双引号
c1="sldkjf"print c1c2="It's a dog"print c2
单引号c1='sldkjf'print c1c2='It"s a dog'print c2 三引号
c1='''jfjsdsdfsdfgfgsgsdgsdhello'''print c1 转义符
print 'It\'s a dog'print "Hello boy\nhello boy" 自然字符串
print r"Hello boy\nhello boy" 字符串的重复
print "Hello girl\n"* 20 子字符串索引运算符从0开始索引切片运算符[a:b]是指从第a下标开始到第b-1下标，同样第一位的下标为0
c1="jekexeyuan"c2=c1[0]c3=c1[7]c4=c1[:2]c5=c1[2:]c6=c1[4:7]print c6