python1-集合、函数-（全局变量与局部变量）

集合

# s=set('hello')
# print(s)
#
# s=set(['alex','alex','sb'])
# print(s)

# s={1,2,3,4,5,6}

#添加
# s.add('s')
# s.add('3')
# s.add(3)
# print(s)

# s.clear()==>清空
# print(s)

# s1=s.copy()==>拷贝

s={'sb',1,2,3,4,5,6}
#随机删
# s.pop()

#指定删除（remove（））
# s.remove('sb')
# s.remove('hellol') #删除元素不存在会报错
# s.discard('sbbbb')#删除元素不存在不会报错discard（）
# print(s)

# python_l=['lcg','szw','zjw','lcg']
# linux_l=['lcg','szw','sb']
# p_s=set(python_l)
# l_s=set(linux_l)

# #求交集intersection（）
# print(p_s,l_s)
# print(p_s.intersection(l_s))
# print(p_s&l_s)

# #求并集union（）
# print(p_s.union(l_s))
# print(p_s|l_s)

# #差集difference（）
# print('差集',p_s-l_s)
# print(p_s.difference(l_s))
# print('差集',l_s-p_s)
# print(l_s.difference(p_s))

#交叉补集symmetric_difference（）
# print('交叉补集',p_s.symmetric_difference(l_s))
# print('交叉补集',p_s^l_s)

python_l=['lcg','szw','zjw','lcg']
linux_l=['lcg','szw','sb']
p_s=set(python_l)
l_s=set(linux_l)
print(p_s,l_s)
# print('差集',p_s-l_s)
# p_s=p_s-l_s
p_s.difference_update(l_s)
print(p_s)

# s1={1,2}
# s2={2,3,5}
# print(s1.isdisjoint(s2))

s1={1,2}
s2={1,2,3}
print(s1.issubset(s2))#s1 是s2 的子集
print(s2.issubset(s1))#False

print(s2.issuperset(s1))#s1 是s2 的父集

s1={1,2}
s2={1,2,3}
# s1.update(s2) #更新多个值

# s1.add(1,2,3,4) #更新一个值
# s1.union(s2) #不更新

print(s1)

s=frozenset('hello')
print(s)
names=['alex','alex','wupeiqi']

names=list(set(names))
print(names)

msg='i am %s my hobby is %s' % ('lhf','alex')
print(msg)

msg='i am %s my hobby is %s' % ('lhf',1)
msg='i am %s my hobby is %s' % ('lhf',[1,2])
print(msg)

name='lhf'
age=19
msg='i am %s my hobby is %s' % (name,age)
print(msg)

打印浮点数

tpl = "percent %.2f" % 99.976234444444444444
print(tpl)

打印百分比

tpl = 'percent %.2f %%' % 99.976234444444444444
# print(tpl)

实例

 tpl = "i am %(name)s age %(age)d" % {"name": "alex", "age": 18}
print(tpl)

msg='i am %(name)+60s my hobby is alex' %{'name':'lhf'}
print(msg)

插入时间

msg='i am \033[43;1m%(name)+60s\033[0m my hobby is alex' %{'name':'lhf'}
print(msg)

',sep=':')

tpl = "i am {name}, age {age}, really {name}".format(name="seven", age=18)tpl = "i am {name}, age {age}, really {name}".format(**{"name": "seven", "age": 18})
 
tpl = "i am {:s}, age {:d}".format(*["seven", 18])
tpl = "i am {:s}, age {:d}".format("seven", 18)["seven", 18]
 
l=["seven", 18]
tpl = "i am {:s}, age {:d}".format('seven',18)
print(tpl)

tpl = "numbers: {:b},{:o},{:d},{:x},{:X}, {:%},{}".format(15, 15, 15, 15, 15, 15.87623, 2)
print(tpl)

python_l=['lcg','szw','zjw']
linux_l=['lcg','szw']
 
python_and_linux_l=[]
for p_name in python_l:
    if p_name in linux_l:
        python_and_linux_l.append(p_name)
 
print(python_and_linux_l)