and运算符就是所谓的布尔运算符,连接两个布尔值,并且在两者都为真时返回真,否则 返回假,or not 可以随意结合真值

短路逻辑 short-circuit logic   惰性求值 lazy evaluation

raw_input 返回值为真

断言,条件后可以添加字符串,用来解释断言

x = 1

Yes = input('Are you readly?')

if Yes.lower() == 'yes':

    while x <= 'yes':

        print(x)

        x += 1

缩进对Python 太重要了!

name = ''

while not name:

    name = input('Please enter your name: ')

print('Hello,%s!' % name)

Name = input('Please input you name: ')

name = Name

while not name or name.isspace():

    #while not name.strip() or while not name or name.isspace()

    #

    name = input('Please enter your name: ')

print('Hello,%s!'% name)

# sequence list   words = ['this','is','an','ex','parrot']

#for word in words:

#    print(word)

"""

numbers = [0,1,2,3,4,5,6,7,8,9]

for number in numbers:

    print(number)

"""

'''

d = {'x':1,'y':2,'z':3}

for key in d:

    print(key,'corresponds to',d[key])

#multiline commit  for python

#one line commeit for Python

'''

'''

d = {'x':1,'y':2,'z':3}

print(d[key])

#for key in d:

#    print(d[value])

'''

'''

d = {'x':1,'y':2,'z':3}

for key,value in d.items():

    print(key,'correspond to',value)

    

'''

"""

names = ['anne','beth','george','damon']

ages = [12,45,32,102]

for i in range(len(names)):

    print(names[i],'is',ages[i],'years old')

for string in strings:

    if 'xxx' in string:

        index = strings.index(string) # Search for the string in the list of strings

        strings[index] = '[censored]'

"""

for string in srings:

    if 'xxx' in string:

        index = strings.index(string)

        strings[index] = '[censored]'