Learn python core programming and python Core

Learn python core programming and python Core

I have read python from scratch for a while, and I have provided HD resources [av4050443] For my website B. However, it is difficult to learn it as a basic program. I downloaded the python core programming pdf, make some notes here.

Although I use the second edition of teaching materials, I am using python3.5.2. I don't feel very similar. I can read it.

Here we start with exercise questions in Chapter 2!

 

 

 

 

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2-5: Use while and for to print 0-10:

I = 0

While I <11:

Print (I)

I + = 1

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For I in range (11 ):

Print (I)

 

 

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2-7: Enter the string and print it. Use the while and:

Str_input = input ('Enter the string :')

I = 0

While I <len (str_input ):

Print (str_input [I])

I + = 1

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Str_input = input ('Enter the string :')

For I in str_input:

Print (I)

 

 

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2-8: add five numbers:

I = 0

Temp = 0

While I <5:

Temp + = int (input ('enter a number :'))

I + = 1

Print (temp)

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Temp = 0

For I in range (5 ):

Temp + = int (input ('enter a number :'))

Print (temp)

 

 

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2-9: average value of the output five values:

Temp = 0

For I in range (5 ):

Temp + = int (input ('enter a number :'))

Arverage = temp/5

Print (arverage)

 

 

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2-10: judge whether to input 1 to 100. If yes, stop. Otherwise, re-input:

Num = int (input ('enter an integer between 1 and 100 :'))

While num not in range (2,101 ):

Print ('incorrect input ')

Num = int (input ('enter an integer between 1 and 100 :'))

Print ('you are right! ')

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It is troublesome to use recursion. I am not very familiar with it (as shown below ):

Def function1 (num ):

If 1 <num <100:

Print ('your number in (1,100 )')

Else:

Print (the number you input is not in (1,100 )')

Num = int (input ('Please input a number :'))

Function1 (num)

 

Num = int (input ('Please input a number :'))

Function1 (num)

 

 

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2-11: Input 1 sum, input 2 get average, input X Exit:

(It's almost a copy of someone else. I wrote one and always reported an error)

Def add ():

Temp = 0

For I in range (5 ):

Temp + = float (input ('enter the number of % d:' % (I + 1 )))

Print (temp)

Def aver ():

Temp = 0

For I in range (5 ):

Temp + = float (input ('enter the number of % d:' % (I + 1 )))

Print (temp/5)

Foo = str (input ('input 1 sum, input 2 get average, input X Exit :'))
If foo = 'X ':
Print ('exit successful ')
Elif foo = '1 ':
Add ()
Elif foo = '2 ':
Aver ()
Else:
Print ('input error ')

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The following is my error Program (which will be changed later ):

Foo = str (input ('input 1 sum, input 2 get average, input X Exit :'))

Temp = 0

For I in range (5 ):

Temp + = float (input ('enter the number of % d:' % (I + 1 )))

If foo = 'X ':
Print ('exit successful ')
Elif foo = '1 ':
Print (temp)
Elif foo = '2 ':
Print (temp/5)
Else:
Print ('input error ')

 

 

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2-15: input three numbers for sorting:

A = float (input ('first number of inputs :'))
B = float (input ('Enter the second number :'))
C = float (input ('Enter the third number :'))

If a> B:
A, B = B, a # ensure that a is small
If a> c:
A, c = c, a # ensure that a is smaller, and a is the smallest
If B> c:
B, c = c, B # ensure that B is smaller

Print (a, B, c)