s = set(['Adam', 'Lisa', 'Paul'])
L = ['Adam', 'Lisa', 'Bart', 'Paul']
for a in L:
if a in s:
s.remove(a)
else:
s.add(a)
print s
L = ['Adam', 'Lisa', 'Bart', 'Paul']
for a in L:
if a in s:
s.remove(a)
else:
s.add(a)
print s
2016-07-13
for x in ['0','1','2','3','4','5','6','7','8','9']:
for y in ['0','1','2','3','4','5','6','7','8','9']:
if x < y:
print x+y
for y in ['0','1','2','3','4','5','6','7','8','9']:
if x < y:
print x+y
2016-07-13
d = {
'Adam': 95,
'Lisa': 85,
'Bart': 59
}
print 'Adam:',d.get('Adam')
print 'Lisa:',d.get('Lisa')
print 'Bart:',d.get('Bart')
'Adam': 95,
'Lisa': 85,
'Bart': 59
}
print 'Adam:',d.get('Adam')
print 'Lisa:',d.get('Lisa')
print 'Bart:',d.get('Bart')
2016-07-13
for x in [ '1','2','3','4','5','6','7','8' ]:
for y in [ '2','3','4','5','6','7','8','9' ]:
if x<y:
print x+y
for y in [ '2','3','4','5','6','7','8','9' ]:
if x<y:
print x+y
2016-07-13
L = [75, 92, 59, 68]
sum = 0.0
for score in L:
sum+=score
print sum / 4
sum = 0.0
for score in L:
sum+=score
print sum / 4
2016-07-13
到底能不能用++啊 前面的还能 这题怎么又不能了。。。
sum = 0
n = 0
while True:
if n==20:
break
sum += 2 ** n
n = n+1
print sum
sum = 0
n = 0
while True:
if n==20:
break
sum += 2 ** n
n = n+1
print sum
2016-07-13
```
sum = 0
x = 1
n = 1
while True:
sum = sum +x
x = x*2
n = n+1
if n>20: #有冒号
break
print sum
```
sum = 0
x = 1
n = 1
while True:
sum = sum +x
x = x*2
n = n+1
if n>20: #有冒号
break
print sum
```
2016-07-13