gangdan'}
pythons_linuxs = pythons & linuxs
print(pythons_linuxs)
2.求出所有报名的学生名字集合
pythons={'jason'...,'nick','sean','tank','gangdan','tiepao'}
linuxs={'tank','oldboy','gangdan'}
pythons_linuxs = pythons...| linuxs
print(pythons_linuxs)
3.求出只报名python课程的学员名字
pythons={'jason','nick','sean','tank','gangdan',...'tiepao'}
linuxs={'tank','oldboy','gangdan'}
pythons_linuxs = pythons - linuxs
print(pythons_linuxs)...','gangdan'}
pythons_linuxs = pythons ^ linuxs
print(pythons_linuxs)
第二部分
1.有列表l=['a','b',1,'a','a'],