def find_min_and_max(L):
if L==[]:
return (None,None)
else:
max=L[0]
min=L[0]
for n in L:
if n>=max:
max=n
if n<=min:
min=n
return (min,max)
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不开心去喝水
def find_min_and_max(L):
if L==[]:
return (None,None)
else:
max=L[0]
min=L[0]
for n in L:
if n>=max:
max=n
if n<=min:
min=n
return (min,max)