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class Solution:
def generate(self, numRows):
"""
:type numRows: int
:rtype: List[List[int]]
"""
if numRows==0:
return []
temp=[0,1]
pt=[]
for i in range(numRows):
rowlist=[]
for j in range(len(temp)-1):
rowlist.append(temp[j]+temp[j+1])
pt.append(rowlist)
temp=rowlist[:]
temp.insert(0,0)
temp.append(0)
return pt