python中定義類的方法很簡單，用關鍵字class， 其中可以包含函數 用 def#!/usr/bin/env?python

#?-*-?coding:UTF-8?-*-

class?Test_N:

"""?class?get?a?name?and?count?string?or?number?"""

def?__init__(self,?n):

self.name?=?n

def?sqrt_num(self,?cn):

if?cn?>=?0:

root?=?cn?**?0.5

return?-root,?root

else:

print?"negative?number."

return

def?c_str(self,?cs):

return?len(cs)

@staticmethod

def?square_list(?*args?):

r?=?[]

for?i?in?args:

r.append(i?**?2)

return?r

def?genome_len(self,?fasta):

return?len(fasta)

def?anno_genome(self?,?gff):

handle?=?open(gff,?‘r‘)

n?=?0

for?i?in?handle:

n?+=?1

handle.close()

return?n

x?=?Test_N("Kate")??????#?initiate?the?class

print?x.name

print?"Kate\‘s?number?is?1235678."

print?"It\‘s?square?root?are:"

print?x.sqrt_num(1235678)??#?invoke?the?function?sqrt_num

print?"Kate\‘s?string?is?agahccp."

print?"It\‘s?count?is:"

print?x.c_str("agahccp")???#?invoke?the?function?c_str

for?i?in?Test_N.square_list(3,4,5,6,7):???#?invoke?the?method?squre_list

print?i

print?x.anno_genome("log.txt")????#?invoke?the?function?anno_genome

輸出結果如下Kate

Kate‘s?number?is?1235678.

It‘s?square?root?are:

(-1111.6105433109205,?1111.6105433109205)

Kate‘s?string?is?agahccp.

It‘s?count?is:

7

9

16

25

36

49

36

其中log.txt 是一個有36行的文件，所以輸出的最后一個數字是36

總結

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