# coding:utf-8
# 获取s中的子串（从第i个位置获取和t一样长的子串）
def substr(s,i,m):
return s[i:i+m]
def index(s,t,pos):
if pos >= 0:
n = len(s)
m = len(t)
i = pos
while i <= n-m+1:
s1 = substr(s,i,m)
if cmp(s1,t):
i += 1
else:
print i+1
i += 1
else:
print 'not exist'
index('I love China! Which country do you love best?','love',0)
# 获取s中的子串（从第i个位置获取和t一样长的子串）
def substr(s,i,m):
return s[i:i+m]
def index(s,t,pos):
if pos >= 0:
n = len(s)
m = len(t)
i = pos
while i <= n-m+1:
s1 = substr(s,i,m)
if cmp(s1,t):
i += 1
else:
print i+1
i += 1
else:
print 'not exist'
index('I love China! Which country do you love best?','love',0)