python学习笔记

# -*- coding: utf-8 -*-
print('%2d-%02d' % (3, 1))
print('%.2f' % 3.1415926)
s1 = 72
s2 = 85
r = (85-72)/72*100
print('设置：','%04.2f %%' % (r))
# 2.list[]、tuple()
classmates = ['Michael','Bob','Tracy']
print(classmates,len(classmates))
for str in classmates:
	print(str)
print('----------------------------------')
classmates.insert(1,'Test')
classmates.append('Mike')
i = 0
while i < len(classmates):
	print(classmates[i])
	i = i + 1
classmates.pop()
classmates.pop(1)
for res in classmates:
	if res == 'Michael':
		print('result: %s' % res)
print('END')
finallist = ('Mspaint','Mscmd','Msservices')
# no finallist.insert(1,'Msddd')
# no finallist.append('Dss')
print('tuple:', finallist)
print('----------------------------------')
# 3. dict{}、set
map = {'A':90, 'B':80, 'C':70}
for m in map:
	print('key:',m,' val:', map.get(m))
	if 'A' in map:
		print('>>>>')
		map['A'] = 95
	if map.get('D', -1) == -1:
		print('>>>>>D:')
map['D'] = 60
print('resMap:', map)
map.pop('A')
print('resMap2:', map)
myset = set([1,2,2,3,3,4])
myset.add(6)
myset.add(7)
myset.remove(3)
print('myset:', myset) 
set2 = set([2,3,8])
print('set2&set1:', myset & set2, myset | set2)
print('----------------------------------')
name = input('按任意键退出...')
print('end',name)