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初识Python

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qq_慕运维2396039

d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59, 'Paul': 74 }

sum = 0.0
for k, v in d.items():
sum = sum + v
n=len(d.items())
print (k,':',v)
print ('average', ':',sum/n )

0 9-4 迭代dict的key和value

2019-03-15

qq_慕运维2396039

d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59, 'Paul': 74 }
sum=0
for value in d.values():
sum+=value
n=len(d.values())
average=sum/n

print(sum,n,average)

0 9-3 迭代dict的value

2019-03-14

qq_慕运维2396039

L = ['Adam', 'Lisa', 'Bart', 'Paul']
for index, name in enumerate(L):
print (index+1, '-', name)

0 9-2 索引迭代

2019-03-14

qq_慕运维2396039

L = range(1, 101)
for x in L:
if x%7==0:
print(x)

0 9-1 什么是迭代

2019-03-14

qq_慕运维2396039

def firstCharUpper(s):
L=s.upper()
return (L[0])

print (firstCharUpper('hello'))
print (firstCharUpper('sunday'))
print (firstCharUpper('september'))

0 8-3 对字符串切片

2019-03-14

weixin_慕妹8166577

计算a or 'world'时，a='python',非空字符串，所以为True，True的话直接返回a的值，不再往后计算，而b or 'world'，b='',字符串为空值，所以为False，此时计算结果取决于or 后面的值，结果为world

0 3-9 Python中布尔类型

2019-03-14

慕勒2001693

print r'''"To be, or not to be": that is the question.
Whether it's nobler in the mind to suffer.'''
print '''"To be, or not to be": that is the question.
Whether it's nobler in the mind to suffer.'''

0 3-6 Python中raw字符串与多行字符串

2019-03-14

葭诩

for x in L:
if x in s:
s.remove(x)
else:
s.add(x)

1 6-10 Python之更新set

2019-03-13

葭诩

s = set([('Adam', 95), ('Lisa', 85), ('Bart', 59)])
for x in s:
print x[0],":",x[1]

0 6-9 Python之遍历set

2019-03-13

葭诩

for key in d:
print key,":",d.get(key)

0 6-5 Python之遍历dict

2019-03-13

葭诩

L = ['1','2','3','4','5','6','7','8','9']
for x in L:
for y in L:
if y > x:
print x + y

1 5-8 Python之多重循环

2019-03-13

葭诩

sum = 0
x = 1
n = 1
while True:
x = x*2
n+=1
if n==21:
sum = x - 1
break
print sum

0 5-6 Python之 break退出循环

2019-03-13

葭诩

sum = 0
x = 1
while x<101:
sum+=x%2
x+=1
print sum

0 5-5 Python之 while循环

2019-03-13

葭诩

L = ['Adam', 'Lisa', 'Paul', 'Bart']
L.pop(-1)
L.pop(-1)
print L

0 4-5 Python从list删除元素

2019-03-13

葭诩

print 2.5 + (10.0 / 4)

1 3-8 Python中整数和浮点数

2019-03-13

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