sum = 0
x = 1
n = 1
while True:
x=2**(n-1)
n+=1
sum+=x
if n>20:
break
print sum
x = 1
n = 1
while True:
x=2**(n-1)
n+=1
sum+=x
if n>20:
break
print sum
2016-07-22
L = []
num = 1
while num <= 100:
L.append(num*num)
num += 1
#print L
print sum(L)
num = 1
while num <= 100:
L.append(num*num)
num += 1
#print L
print sum(L)
2016-07-22
s = set(['Adam', 'Lisa', 'Paul'])
L = ['Adam', 'Lisa', 'Bart', 'Paul']
for l in L:
if l in s:
s.remove(l)
else:
s.add(l)
print s
L = ['Adam', 'Lisa', 'Bart', 'Paul']
for l in L:
if l in s:
s.remove(l)
else:
s.add(l)
print s
2016-07-22
months = set(['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul','Aug','Sep','Oct','Nov','Dec'])
2016-07-22
修复:
age = 20
if age >=6 and age<18:
print 'teenager'
elif age >= 18:
print 'adult'
else:
print 'kid'
age = 20
if age >=6 and age<18:
print 'teenager'
elif age >= 18:
print 'adult'
else:
print 'kid'
2016-07-22
sum = 0
x = 1
n = 1
while True:
sum = sum+x
x = x*2
n = n+1
if n > 20:
break
print sum
x = 1
n = 1
while True:
sum = sum+x
x = x*2
n = n+1
if n > 20:
break
print sum
2016-07-22
def move(n, a, b, c):
if n == 1:
print a,'-->',c
return
else:
move(n-1, a, c, b)
move(1, a, b, c)
move(n-1, b, a, c)
move(4, 'A', 'B', 'C')
if n == 1:
print a,'-->',c
return
else:
move(n-1, a, c, b)
move(1, a, b, c)
move(n-1, b, a, c)
move(4, 'A', 'B', 'C')
2016-07-22
100以内的整数和可以用range或xrange实现
sum = 0
for x in range(1,101):
sum = sum + x
print sum
如果在for循环中键入print sum,则解释器会反映出每一步的过程(循环过程)。
sum = 0
for x in range(1,101):
sum = sum + x
print sum
如果在for循环中键入print sum,则解释器会反映出每一步的过程(循环过程)。
2016-07-21