初识Python_技术问答

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初识Python

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珂茶婆

这节课收获很大！

0 3-4 Python中什么是变量

2015-09-07

John_Pan

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

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

0 10-3 条件过滤

2015-09-06

John_Pan

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

0 10-2 复杂表达式

2015-09-06

John_Pan

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

0 10-1 生成列表

2015-09-06

到第三章就没老师讲课了

最新回答 / Perona

可能觉得图文比较适合，顺便敲代码练习

1 回答 355 浏览

2015-09-06

John_Pan

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

sum = 0.0
for i in d.values():
sum = sum + i
print sum / len(d) #len(d) be noted

0 9-3 迭代dict的value

2015-09-06

John_Pan

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

LL = zip(range(1,5),L)
for index,name in LL: # no enumerate()
print index,'-',name

0 9-2 索引迭代

2015-09-06

John_Pan

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

0 9-1 什么是迭代

2015-09-06

John_Pan

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

0 8-3 对字符串切片

2015-09-06

John_Pan

L = range(1, 101)
print L[-10:]
print L[-46::5]
print L[4::5][-10:] #[4::5]是正序取5的倍数，[-10:]逆序取后10个，better way