Python——Dict类型

q989

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