Python——Dict类型

以下是学习goole PYTHON教程过程中的一些笔记。

'# ' 后面的是输出，希望你能从中获取你想要的。

Dict

d = {}

d['a'] = 'alpha'

d['g'] = 'gamma'

d['o'] = 'omega'

d['a'] #'alpha'

d['x'] #error

d.get('x') #

d.get('a') #'alpha'

'a' in d #True

'x' in d #False

d.keys() #['a,','g','o']

d.values() #['alpha','gamma',omega]

for k in sorted(d.keys()): print 'key:', k, '->' ,d[k]

#key: a -> alpha

#key: g -> gamma

#key: o -> omega

d.items()

#[('a', 'alpha'), ('g', 'gamma'), ('o', 'omega')]

for tuple in d.items(): print tuple

#('a', 'alpha')

#('g', 'gamma')

#('o', 'omega')

def Cat(filename):

f = open(filename, 'rU')

#lines = f.readlines()

#print lines#lines is a list

text = f.read()

print text, #read the entile file into a string

#print line,#without a newline