初识Python_技术问答

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初识Python

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桃子入侵

print [x*100 + y*10 + z*1 for x in range(1,10) for y in range(0,10) for z in range(1,10) if [x, y, z] == [z, y, x]]

0 10-4 多层表达式

2016-01-23

桃子入侵

def toUppers(L):
return [x.upper() for x in L if isinstance(x,str)]

print toUppers(['Hello', 'world', 101])

0 10-3 条件过滤

2016-01-23

桃子入侵

def generate_tr(name, score):
if score < 60:
return '<tr><td>%s</td><td style="color:red">%s</td></tr>' % (name, score)
else:
return '<tr><td>%s</td><td>%s</td></tr>' % (name, score)

tds = [generate_tr(name, score) for name, score in d.iteritems()]

0 10-2 复杂表达式

2016-01-23

桃子入侵

print [x * (x + 1) for x in range(1,100,2)]

1 10-1 生成列表

2016-01-23

桃子入侵

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

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

0 9-4 迭代dict的key和value

2016-01-23

桃子入侵

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

sum = 0.0
for v in d.values():
sum = sum + v
print sum/ len(d)

0 9-3 迭代dict的value

2016-01-23

桃子入侵

for i in range(1,101)[6::7]:
print i

0 9-1 什么是迭代

2016-01-23

桃子入侵

def firstCharUpper(s):
return s[0].upper() + s[1:]

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

0 8-3 对字符串切片

2016-01-23

桃子入侵

L = range(1, 101)
print L[-10:]
print L[4::5][-10:]

3 8-2 倒序切片

2016-01-23

桃子入侵

def average(*args):
n = len(args)
if n == 0:
return 0.0
else:
return sum(args)*1.0/ n

print average()
print average(1, 2)
print average(1, 2, 2, 3, 4)

0 7-7 Python之定义可变参数

2016-01-23