python的数与字符串

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