上午初步了解python

print('hello world!')
'''
print('hello world!')
'''

# name = 'tank'
#
# print(name)


# id,type,value
x = 10
y = 10

'''
python小计数池(python优化机制):
    在变量值产生后指定的范围内，
    在内存中事先开辟一块内存空间，
    然后分别把指定范围内的变量存放进去。
'''
# print(id(x))
# print(id(y))

# name = 'tank'
# print(type(x))
# print(type(name))

# 判断值是否相等
# print(x == y)

# 判断id是否相等
# print(x is y)


# 常量（常量也是变量，在python中大家都规定只要是大写的变量都称之为常量）
SCHOOL = '安徽工程大学'


# 用户与程序交互
# name = input('input your name:')
# pwd = input('请输入密码:')
#
# print(name, pwd)
# print(type(name), type(pwd))

'''
python2:
    raw_input()
    
python3:
    input()

'''


# 数字类型

# 整型int
# number = 100  # int(100)
# number2 = int(100)
# print(number)
# print(number2)


# 浮点型 float
# sal = 15.0  # float(15.0)
# sal2 = float(15.0)
# print(sal)
# print(sal2)


# 字符串类型
# name = 'tank'
# name2 = "tank"
# content = '''
# 1r1r1r
# 21r12r1
# r12r
# 12r1r21
# r12r1r2
# 12r1r
# '''
#
# print(name, name2, content)

# python中字符串可以相加、相乘
# print('tank ' * 5)
# print('tank' + 'jam')
# print('tank', 'jam')


# 列表类型
# []括号内以逗号隔开，可存放多个不同类型的值。
# list1 = ['张曼曼', 'tank', '涂懿磊', 11, 1.0, ['jason', 200]]
# print(list1[0])
# print(list1[5][0])

# 字典类型
# 在{}内，都逗号隔开，可存放多个值，每个值以key: value的形式存储
# 存
# dict1 = {'name': "tank", "age": 18}  # {name="tank", "age"=18}

# 取
# print(dict1["name"])


# 布尔类型
# True or False
# print(10 == 10)  # True
# print(10 == 11)  # False

# 注意: 所有数据类型都自带布尔， 0、None、空都为False
# if 0:
#     print('111')
#
# if None:
#     print('111')
#
# if []:
#     print('111')
#
# else:
#     print('222')



# 格式化输出
# 可以在输出时给字符串类型做一次替换
# %s占位符，%d可以替换数字类型
# number = input('请输入:')
# str1 = '''
# 尊敬的用户，您的话费余额为%s元。
# ''' % number
#
# print(str1)


# for循环
# list1 = [1, 2, 3, 4, 5]
# for line in list1:
#     print(line)

# for line in range(1, 10):
#     print(line)

# dict1 = {'name': "tank", "age": 18}
# for key in dict1:
#     print(key)
#     print(dict1[key])

下午

# '''
# str1='my name is xxx,my age is 18'
# #祛除左右空格strip
# print(str1)
# print(str1.strip())
# #切分split
# list2=str1.split(' ')
# print(list2)
# str2='my name is xxx,my age is 18'
# for line in str2:
#     print(line,end=" ")
# str6 = 'my name in Tank'
# print(str6.lower())
# print(str6.upper())#lower 小写    upper 大写
# print(str6.startswith('my')) #startswith   判断前面  endswith 判断后面
# print(str6.startswith('My'))
# print(str6.endswith('tank'))
# #fomat 三种玩法
# str7 = 'my name in {}，my age is{}'
# str7=str7.format('tank',18)
# print(str7)
#
# str7='my name in {1}，my age is{2}'
# str7=str7.format('tank',18,111)
# print(str7)
#
# str7='my name in {name}，my age is{age}'
# str7=str7.format(name='tank',age=18)
# print(str7)
# '''
# # join 对列表中的数据按照某种标识拼接 拼接要为字符串类型
# name ='tank'
# age='20'
# print(':'.join([name,age]))
# #replace
# str8 ='old new'
# str8=str8.replace('old','new')
# print(str8)
# #isdigit 判断字符串是否为数字
# ID =input('请输入')
# print(ID)
# print(ID.isdigit())
list1=['tank',18,'womale',3.0,9]
print(list1[4])
print(list1[-2])

# '''
# str1='my name is xxx,my age is 18'
# #祛除左右空格strip
# print(str1)
# print(str1.strip())
# #切分split
# list2=str1.split(' ')
# print(list2)
# str2='my name is xxx,my age is 18'
# for line in str2:
#     print(line,end=" ")
# str6 = 'my name in Tank'
# print(str6.lower())
# print(str6.upper())#lower 小写    upper 大写
# print(str6.startswith('my')) #startswith   判断前面  endswith 判断后面
# print(str6.startswith('My'))
# print(str6.endswith('tank'))
# #fomat 三种玩法
# str7 = 'my name in {}，my age is{}'
# str7=str7.format('tank',18)
# print(str7)
#
# str7='my name in {1}，my age is{2}'
# str7=str7.format('tank',18,111)
# print(str7)
#
# str7='my name in {name}，my age is{age}'
# str7=str7.format(name='tank',age=18)
# print(str7)
# '''
# # join 对列表中的数据按照某种标识拼接 拼接要为字符串类型
# name ='tank'
# age='20'
# print(':'.join([name,age]))
# #replace
# str8 ='old new'
# str8=str8.replace('old','new')
# print(str8)
# #isdigit 判断字符串是否为数字
# ID =input('请输入')
# print(ID)
# print(ID.isdigit())
list1=['tank',18,'womale',3.0,9]
print(list1[4])
print(list1[-2])
print(list1[1:5:2])

print(len(list1))
#追加 append()
list1.append('sjkd')
print(list1)
#删除 pop()默认最后一个-1
print(list1.pop())
print(list1.pop(0))
print(list1)
list1.
#循环

作业

name = " alex"
name = name.strip()
print(name)
name1 = name.startswith('al')
print(name1)
name2 = name.endswith('x')
print(name2)
name3 = name.replace('l', 'p')
print(name3)
name4 = name.split('l')
print(name4)
print(name.upper())
print(name.lower())
print(name[2])
print(name[1:4])
print(name[-2:-1])
print(name.index('e'))
print(name[0:len(name)-1])

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