day02 python basis

# Define a list of students that can store more than one student 
'' ' Student = [' Zhao money, '' Lee Sun ',' Zhou Wu ',' Zheng Wang '] 
Print (Student [1]) # Sun Li 

student_info = [ 'Bo', 72, 'male', [ ' bubble 8', '9 drink']] 
# Bo all students interested 
Print (student_info [. 3]) 
# Bo is interested student second 
print (student_info [3] [ 1]) 

# 4, and the members in operation in Not 
Print ( 'Bo' in student_info) #True 
Print ( 'Bo' Not in student_info) #False 

#. 5, additionally 
student_info = [ 'Bo', 72, 'male', [ 'bubble 8', '9 drink']] 
student_info.append ( 'Anhui Academy cattle, HEFEI') 
Print (student_info) 

Print (student_info [-2]) 
# [ 'bubble 8', '9 drink' ] 
Print (student_info [0:. 4: 2]) 
# [ 'Bo','MALE'] 
Print ( 'Bo' in student_info) #True 
Print ( 'Bo' not in student_info) #False

# 6, delete 
del student_info [2] 
Print (student_info) '' ' 

' '' # to master 
student_info = [ '123', 18 , 'male', [ ' perception', 'call wheat'], 18] 
# 1 , index get a list of index values 
Print (student_info.index (18)) # 1 
# 2, COUNT get a list of the number of a value of 
Print (student_info.count (18)) # 2 

# 3, values, the default list last value, similar to delete 
# If the pop () brackets write the index, the index takes a value corresponding to 
student_info.pop () 
Print (student_info) 

Sex = student_info.pop (2) 
Print (Sex) 
Print (student_info ) 

# 4 removed 
student_info.remove (18 is) 
Print (student_info) # [ '123', [ 'perception', 'call wheat']] 

name = student_info.remove ( '123')
print(name) #None
print(student_info)'''

#5, insert the value 
'' ' student_info = [' 123 ', 95' MALE ', [' embarrassed dance ',' call wheat '], 95] 
# in student_info, the index location 3 is inserted "Hefei" 
student_info .insert (3, 'Hefei') 
Print (student_info) '' ' 

# . 6, the merge list Extend 
' '' student_info1 = [ '123', 18 is, 'MALE', [ 'perception 1', '2 wheat call' ], 18 is] 
student_info2 = [ '456', 95 'MALE', [ 'embarrassed dance', 'call wheat'], 95] 

student_info1.extend (student_info2) 
Print (student_info1) '' '

Tuple: in () may be any type storing a plurality of values, separated by commas.

Note: tuples and lists is not the same, only the initialization value is defined, it can not be modified.

Advantage: occupies memory resources smaller than list.

'''tuple1 = (1, 2, 3, '五', '六')
print(tuple1)#(1, 2, 3, '五', '六')

print(tuple1[2])#3

print(tuple1[0:5:3])# (1, '五')

print(len(tuple1))#5

print(1 in tuple1)#True
print(1 not in tuple1)#False

for line in tuple1:
    print(line)'''

Immutable type:

#不可变类型
#int
'''number = 100
print(id(number)) #1978694208
number = 111
print(id(number)) #1978694560

#float
sal = 1.0
print(id(sal)) #2210740179472
sal = 2.0
print(id(sal)) #2210740179304


str1 = 'hello python!'
print(id(str1)) #2210741626416
str2 = str1.replace('hello', 'like')
print(id(str2)) #2210741626288'''

Variable type:

'''list1 = [1,2,3]
list2 = list1

list1.append(4)

print(id(list1))
print(id(list2))
print(list1)
print(list2)'''

Dictionary type:

In the {}, separated by commas can store a plurality of values, key-value to access, fast speed value.

Definitions: key must be immutable type, value may be any type

'''dict1 = dict({'age':18,'name': 'nj'})
print(dict1) #{'age': 18, 'name': 'nj'}
print(type(dict1)) #<class 'dict'>

print(dict1['age']) #18

dict1['level'] = 9
print(dict1) #{'age': 18, 'name': 'nj', 'level': 9}
print(dict1['name']) #nj

print('name' in dict1) #True
print('nj' in dict1) #False
print('nj' not in dict1) #True

del dict1['level']
print(dict1) #{'age': 18, 'name': 'nj'}

print(dict1.keys()) #dict_keys(['age', 'name'])
print(dict1.values()) #dict_values([18, 'nj'])
print(dict1.items()) #dict_items([('age', 18), ('name', 'nj')])

for key in dict1:
    print(key) 
    print(dict1[key])

dict1 = {'age': 18,'name': 'nj'}

print(dict1.get('sex')) #None
print(dict1.get('sex','male')) #male'''

cycle:

# The while loop 
'' ' str1 =' Tank ' 
the while True: 
    name = the INPUT (' Please enter the characters guess: ') .strip () 
    IF name ==' Tank ': 
        Print ('! Tank Success ') 
        BREAK 

    Print (' Please re-enter ')! ' '' 


# limit cycles 
' '' str1 = 'NJ' 
NUM = 0 

the while NUM <. 3: 
    name = iNPUT ( 'enter guess characters:.') Strip () 
    IF name == 'NJ': 
        Print ( '! NJ Success') 
        BREAK 

    Print ('! Please re-enter ') 
    NUM = +. 1 ' ''

File handling:

'''with open('file.txt','w',encording='utf-8') as f:
    f.write('墨菲定律')

with open('file.txt','r',encording='utf-8') as f:
    res = f.read()
    print(res)

with open('file.txt','a',encording='utf-8') as f:
    f.write('围城')'''

'''with open('cxk.jpg', 'rb') as f:
    res=f.read()
    print(res)

jpg = res

with open('cxk_copy.jpg','wb') as f_w:
    f_w.write(jpg)

with open('cxk.jpg', 'rb') as f_r,open('cxk_copy.jpg','wb') as f_w:
    res = f_r.read()
    f_w.write(res)'''

function:

# 1, no function parameter 
'' ' DEF Login (): 
    User = INPUT (' Enter a username ') .strip () 
    pwd = INPUT (' Enter Password ') .strip () 

    IF User ==' Tank ' == pwd and '123': 
        Print ( '! Login successful') 

    the else: 
        Print ( 'Login error!') 

Print (Login) 

Login () '' ' 

# 2, has a function parameter 
' '' DEF Login (username, password): 
    the user the iNPUT = ( 'Please enter your user name') .strip () 
    pwd = the iNPUT ( 'Please enter your password') .strip () 

    IF the user == == username and password pwd: 
        Print ( 'the Login successful!' ) 
        
    the else: 
        Print ( '! the Login error') 

the Login ( 'Tank ',' 123 ') ' '' 


# definition phase: position parameter 
'' 'FUNC DEF (X, Y): 
    Print (X, Y) 
    
FUNC (10,100) 

DEF FUNC (X, Y): 
    Print (X, Y) '' ' 

# nested function definition 
' '' DEF func1 (): 
    Print ( '... from func1') 

    DEF func2 (): 
        Print ( '... from func2') 

Print (func1) 

DEF F1 (): 
    Pass 
DEF F2 (): 
    Pass 

DIC1 = { '. 1': F1, ' 2 ': F2} 

choice = INPUT (' select numbers: ') 
IF == choice'. 1 ': 
    Print (DIC1 [choice]) 
    DIC1 [choice] () 
    
elif choice ==' 2 ': 
    Print (DIC1 [ Choice]) 
    DIC1 [Choice] () '' '