Python字符串的填充和计数

zfill函数

功能

为字符串定义长度, 如不满足,缺少的部分用0填充

用法

newstr = string.zfill(width)

参数

width: 新字符串希望的宽度

注意事项

• 与字符串的字符无关
• 如果定义长度小于当前字符串长度,则不发生变化

代码

	# coding:utf-8
	heart = 'love'
	if __name__ == '__main__':
	print(' t ' + heart)
	print('t ' + heart)
	print(heart.zfill(10))
	print(heart.zfill(9))
	print(heart.zfill(8))
	print(heart.zfill(6))
	print(heart.zfill(4))

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字符串的count函数

功能

返回当前字符串中某个成员(元素)的个数

用法

inttpe = string.count(item)

参数

item: 查询个数的元素

注意事项

• 返回的是整形
• 如果查询的成员(元素)不存在,则返回0

	# coding:utf-8
	info = '''
	The mission of the Python Software Foundation is to promote,
	protect, and advance the Python programming language,
	and to support and facilitate the growth of a diverse and
	international community of Python programmers.
	'''
	a = info.count('a')
	b = info.count('b')
	c = info.count('c')
	d = info.count('d')
	e = info.count('e')
	f = info.count('f')
	print(a, b, c, d, e, f)
	number_list = [a, b, c, d, e, f]
	print(number_list)
	print('在列表中最大的数值是', max(number_list))
	number_dict = {
	'a': a,
	'b': b,
	'c': c,
	'd': d,
	'e': e,
	'f': f,
	}
	print('每个成员对应的数值分别是', number_dict)

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