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print(demo(x))
5.4 ÔÚº¯ÊýÄÚ²¿¿ÉÒÔͨ¹ý¹Ø¼ü×Ö global À´¶¨ÒåÈ«¾Ö±äÁ¿¡£
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5.6 µ÷ÓôøÓÐĬÈÏÖµ²ÎÊýµÄº¯Êýʱ£¬²»ÄÜΪĬÈÏÖµ²ÎÊý´«µÝÈκÎÖµ£¬±ØÐëʹÓú¯Êý¶¨ÒåʱÉèÖõÄĬÈÏÖµ¡££¨¶Ô¡¢´í£©
5.7 ÔÚPython³ÌÐòÖУ¬¾Ö²¿±äÁ¿»áÒþ²ØÍ¬ÃûµÄÈ«¾Ö±äÁ¿Âð£¿Çë±àд´úÂë½øÐÐÑéÖ¤¡£ ´ð°¸£º»á¡£ >>> def demo(): a=3 print a >>> a=5 >>> demo() 3 >>> a 5
5.8 lambda±í´ïʽֻÄÜÓÃÀ´´´½¨ÄäÃûº¯Êý£¬²»ÄÜΪÕâÑùµÄº¯ÊýÆðÃû×Ö¡££¨¶Ô¡¢´í£© 5.9 ±àдº¯Êý£¬¿ÉÒÔ½ÓÊÕÈÎÒâ¶à¸öÕûÊý²¢Êä³öÆäÖеÄ×î´óÖµºÍËùÓÐÕûÊýÖ®ºÍ¡£ ´ð£ºÕâÀï¸ø³öPython 3.4.2´úÂ룬Èç¹ûʹÓÃPython 2.7.8µÄ»°Ö»ÐèÒªÐÞ¸ÄÆäÖеÄprint()º¯ÊýΪprintÓï¾ä¼´¿É¡£ def demo(*v): print(v)
print(max(v)) print(sum(v)) demo(1,2,3) demo(1,2,3,4) demo(1,2,3,4,5)
5.10 ±àдº¯Êý£¬Ä£ÄâÄÚÖú¯Êýsum()¡£
´ð£ºÕâÀï¸ø³öPython 3.4.2´úÂ룬Èç¹ûʹÓÃPython 2.7.8µÄ»°Ö»ÐèÒªÐÞ¸ÄÆäÖеÄprint()º¯ÊýΪprintÓï¾ä¼´¿É¡£ def Sum(v): s = 0
for i in v: s += i return s x = [1,2,3,4,5] print(Sum(x)) x = (1,2,3,4,5) print(Sum(x))
5.11 °üº¬ yield Óï¾äµÄº¯Êý¿ÉÒÔÓÃÀ´´´½¨Éú³ÉÆ÷¡£ 5.12 ±àдº¯Êý£¬Ä£ÄâÄÚÖú¯Êýsorted()¡£
´ð£ºÕâÀï¸ø³öPython 3.4.2´úÂ룬Èç¹ûʹÓÃPython 2.7.8µÄ»°Ö»ÐèÒªÐÞ¸ÄÆäÖеÄprint()º¯ÊýΪprintÓï¾ä¼´¿É¡£ def Sorted(v): t = v[::] r = [] while t:
tt = min(t) r.append(tt) t.remove(tt) return r
x = [1,3,5,2,1,0,9,7] print(x)
print(Sorted(x))
µÚ6ÕÂ ÃæÏò¶ÔÏó³ÌÐòÉè¼Æ
6.1 ¼Ì³Ð6.5½ÚÀý2ÖеÄPersonÀàÉú³ÉStudentÀ࣬Ìîдеĺ¯ÊýÓÃÀ´ÉèÖÃѧÉúרҵ£¬È»ºóÉú³É¸ÃÀà¶ÔÏó²¢ÏÔʾÐÅÏ¢¡£
´ð£ºPython 3.4.2´úÂëΪ
import types
class Person(object): #»ùÀà±ØÐë¼Ì³ÐÓÚobject£¬·ñÔòÔÚÅÉÉúÀàÖн«ÎÞ·¨Ê¹ÓÃsuper()º¯Êý def __init__(self, name = '', age = 20, sex = 'man'): self.setName(name) self.setAge(age) self.setSex(sex) def setName(self, name):
if not isinstance(name,str):
print('name must be string.') return
self.__name = name def setAge(self, age):
if not isinstance(age,int):
print('age must be integer.') return
self.__age = age def setSex(self, sex):
if sex != 'man' and sex != 'woman':
print('sex must be \ return
self.__sex = sex def show(self):
print(self.__name) print(self.__age) print(self.__sex) class Student(Person):
def __init__(self, name='', age = 30, sex = 'man', major = 'Computer'): #µ÷ÓûùÀ๹Ôì·½·¨³õʼ»¯»ùÀàµÄ˽ÓÐÊý¾Ý³ÉÔ± super(Student, self).__init__(name, age, sex)
self.setMajor(major) #³õʼ»¯ÅÉÉúÀàµÄÊý¾Ý³ÉÔ± def setMajor(self, major):
if not isinstance(major, str):
print('major must be a string.') return
self.__major = major def show(self):
super(Student, self).show()
print(self.__major) if __name__ =='__main__':
zhangsan = Person('Zhang San', 19, 'man') zhangsan.show()
lisi = Student('Li Si',32, 'man', 'Math') lisi.show()
6.2 Éè¼ÆÒ»¸öÈýάÏòÁ¿À࣬²¢ÊµÏÖÏòÁ¿µÄ¼Ó·¨¡¢¼õ·¨ÒÔ¼°ÏòÁ¿Óë±êÁ¿µÄ³Ë·¨ºÍ³ý·¨ÔËËã¡£ ´ð£ºPython 3.4.2´úÂëÈçÏ class Vecter3:
def __init__(self, x=0, y=0, z=0): self.X = x self.Y = y self.Z = z
def __add__(self, n): r = Vecter3()
r.X = self.X + n.X r.Y = self.Y + n.Y r.Z = self.Z + n.Z return r
def __sub__(self, n): r = Vecter3() r.X = self.X - n.X r.Y = self.Y - n.Y r.Z = self.Z - n.Z return r
def __mul__(self, n): r = Vecter3() r.X = self.X * n r.Y = self.Y * n r.Z = self.Z * n return r
def __truediv__(self, n): r = Vecter3() r.X = self.X / n r.Y = self.Y / n r.Z = self.Z / n return r
def __floordiv__(self, n): r = Vecter3() r.X = self.X // n r.Y = self.Y // n r.Z = self.Z // n
return r def show(self):
print((self.X,self.Y,self.Z)) v1 = Vecter3(1,2,3) v2 = Vecter3(4,5,6) v3 = v1+v2 v3.show() v4 = v1-v2 v4.show() v5 = v1*3 v5.show() v6 = v1/2 v6.show()
6.3 ÃæÏò¶ÔÏó³ÌÐòÉè¼ÆµÄÈýÒªËØ·Ö±ðΪ ·â×° ¡¢ ¼Ì³Ð ºÍ ¶à̬ ¡£ 6.4 ¼òµ¥½âÊÍPythonÖÐÒÔÏ»®Ïß¿ªÍ·µÄ±äÁ¿ÃûÌØµã¡£ ´ð£º
ÔÚPythonÖУ¬ÒÔÏ»®Ïß¿ªÍ·µÄ±äÁ¿ÃûÓÐÌØÊâµÄº¬Ò壬ÓÈÆäÊÇÔÚÀàµÄ¶¨ÒåÖС£ÓÃÏ»®Ïß×÷Ϊ±äÁ¿Ç°×ººÍºó׺À´±íʾÀàµÄÌØÊâ³ÉÔ±£º
? _xxx£ºÕâÑùµÄ¶ÔÏó½Ð×ö±£»¤±äÁ¿£¬²»ÄÜÓÃ'from module import *'µ¼È룬ֻÓÐÀà¶ÔÏóºÍ×ÓÀà¶ÔÏóÄÜ·ÃÎÊÕâЩ±äÁ¿£»
? __xxx__£ºÏµÍ³¶¨ÒåµÄÌØÊâ³ÉÔ±Ãû×Ö£»
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6.5 ÓëÔËËã·û¡°**¡±¶ÔÓ¦µÄÌØÊâ·½·¨ÃûΪ __pow__() £¬ÓëÔËËã·û¡°//¡±¶ÔÓ¦µÄÌØÊâ·½·¨ÃûΪ __floordiv__() ¡£
6.6 ¼ÙÉèaΪÀàAµÄ¶ÔÏóÇÒ°üº¬Ò»¸ö˽ÓÐÊý¾Ý³ÉÔ±¡°__value¡±£¬ÄÇôÔÚÀàµÄÍⲿͨ¹ý¶ÔÏóaÖ±½Ó½«Æä˽ÓÐÊý¾Ý³ÉÔ±¡°__value¡±µÄÖµÉèÖÃΪ3µÄÓï¾ä¿ÉÒÔд×÷ a._A__value ¡£