本文共 1220 字,大约阅读时间需要 4 分钟。
def func (a,b,c): print('a = %s' % a) print('b = %s' % b) print('c = %s' % c)
调用
func (1, c = 2, b = 3)
在参数的前面加 * ,定义可变长参数
def howLong (first, *other): # 统计参数的个数,first是必传,参数个数为1 print(1 + len(other)) # 参数的个数可以随意howLong('123','456','789')
var1 = 123def func (): global var1 # 声明为全局变量之后,函数内部更改值后,函数外部也会改变 var1 = 456 print(var1)func()print(var1)
输出:
456 456
list = ['123','456','789']it = iter(list)print( next(it) )print( next(it) )print( next(it) )print( next(it) ) # error
输出:
123 456 789
关键字yield
def frange(start,stop,step): x = start while x < stop: yield x x += stepfor i in frange(10, 20 , 0.5): print(i)
输出:
10 10.5 11.0 11.5 …
读取TXT文件,并全局查找的函数,使用了with优雅的代替try
def find_item (hero): with open('sanguo.txt') as f: data = f.read().replace('\n','') name_num = re.findall(hero,data) # print('主角 %s 出现 %s 次' %(hero,len(name_num))) return len(name_num)
读取人物名称
hero_dict = {}with open('name.txt') as namefile: nameArr = namefile.read().split('|') # print('姓名数组:%s' %nameArr) for hero in nameArr: hero_dict[hero] = find_item(hero) print(hero_dict)
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