Basic programming

All code is entered, use text input

Write a simple program

Circle area formula: area = radius * radius * 3.1415

Not need to define the data type. Python

Read console input

is input into the input string
eval

In jupyter using shift + tab key to jump interpreting the document

Variable naming specification

Consists of letters, numbers, underscores
You can not start with a number *
Identifiers can not be keywords (actually can force change, but for coding standard is extremely unsuitable)
It may be any length
Camel name

Variable assignment statements and assignment expressions

Variables: Popular understood to amount may vary
x = 2 * x + 1 is a mathematical equation, and in that it is an expression language
test = test + 1 * variables must have a value before assigning

Meanwhile assignment

var1, var2,var3... = exp1,exp2,exp3...

Define constants

Constant: it shows a value identifier, suitable for multiple use scenario. For example, PI
Note: If you define constants, so the constant is low can not be changed in the other language, but in Python everything is an object, but also the constant can be changed

Numeric data types and operators

There are two types of values (int and float) suitable for addition, subtraction, die in Python, power of

Operator /, //, **

Operator%

EP：

25/4 number, if you want to convert it to an integer how to rewrite
Enter a number is odd or even is determined
Advanced: Enter a number of seconds, to write a program to convert and second components: for example, 500 seconds is equal to 8 minutes and 20 seconds
Advanced: If today is Saturday, then after 10 days of the week? Tip: Every week day 0 Sunday

Scientific notation

1.234e + 2
1.234e-2

And calculating a priority calculation expression

Enhanced assignment operator

Type Conversion

float -> int
Rounding round

EP:

If a sales tax of 0.06%, the annual income for 197.55e + 2, and how much to pay tax? (2 result retains a decimal)
You must use scientific notation

Project

Written in Python and a loan calculator program: input is a monthly (monthlyPayment) output is the total number of payments (totalpayment

Homework

1

In [2]

 
         celsius = float(input("Enter a degree in Celsius:")) 
         fahrenheit = ( 9 / 5) * celsius + 32 
         print('{} Celsius is {} Fashrenheit'.format(celsius,fahrenheit))

Enter a degree in Celsius:43
43.0 Celsius is 109.4 Fashrenheit

2

In [1]:

 
         import math  
         radius = float(input('Enter the radius :')) 
         length = float(input('Enter the length :')) 
         area = radius * radius * math.pi 
         volume = area * length  
         print('The area is:%.4f' % area) 
         print('The volume is:%.1f' % volume)

 
        

Enter the radius :5.5
Enter the length :12
The area is:95.0332
The volume is:1140.4

3

In [8]:

 
         feet = float(input('Enter a value for feet :')) 
         meters =(305 / 1000) * feet 
         print('{} feet is {:.4f} meters:'.format(feet, meters))

Enter a value for feet :16.5
16.5 feet is 5.0325 meters:

4

In [10]:

 
         import math  
         M = float(input('Enter the amount of in kilograms :')) 
         initialTemperature = float(input('Enter the initial temperature :')) 
         finalTemperature = float(input('Enter the final temperature :')) 
         Q = M * (finalTemperature - initialTemperature) * 4184 
         print('The energy needed is:%.1f' % Q)

Enter the amount of in kilograms  :55.5
Enter the initial temperature :3.5
Enter the final temperature :10.5
The energy needed is:1625484.0

5

In [1]:

 
         import math  
         balance,interstrate = map(float,input('Enter balance and interest rate (e.g., 3 for 3%):').split(',')) 
         interest = balance * (interstrate / 1200) 
         print('The interest  is:%.5f' % interest)

Enter balance and interest rate (e.g., 3 for 3%):1000,3.5
The interest  is:2.91667

6

In [2]:

            
         import math  
         v0,v1,t = map(float,input('Enter v0, v1, and t:').split(',')) 
         a = (v1 - v0 ) / t 
         print('The average acceleration  is:%.4f' % a)

Enter v0, v1, and t:5.5,50.9,4.5
The average acceleration  is:10.0889

7 进阶

In [11]:

 
         import math 
         A = float(input("Enter the monthly saving amount:")) 
         B=A * ( 1 + 0.00417) 
         C=(A + B) * ( 1 + 0.00417) 
         D=(A + C) * ( 1 + 0.00417) 
         E=(A + D) * ( 1 + 0.00417) 
         F=(A + E) * ( 1 + 0.00417) 
         G=(A + F) * ( 1 + 0.00417) 
         print('After the sixth month, the account value is :%.2f' %G) 


 
        

Enter the monthly saving amount:100
After the sixth month, the account value is :608.82

8 进阶

In [6]:

         
         number = int(input("Enter a number between 0 and 1000:")) 
         a = number // 100 
         b = number // 10 % 10 
         c = number % 10 
         print('The sum of the digits is',a+b+c, end = ' ')

Enter a number between 0 and 1000:999
The sum of the digits is 27 




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计算器

a = int (input('请输入一个数字 = '))
b = int (input ('请输入一个数字 = '))
print('%d + %d = %d' % (a,b, a + b))
print('%d - %d = %d' % (a,b, a - b))
print('%d * %d = %d' % (a,b, a * b))

判断闰年平年

year = int(input( 'year:>>'))
if (year % 4 ==0 and year % 100 !=0) or (year % 400 == 0):
print('闰年')
else:
print('平年')

华氏转摄氏

F = float(input("输入华氏度："))
C = (F-32) / 1.8
print('{} 华氏度 = {} 华氏度'.format(F,C))

正方形：

for i in range(10):
print('# ',end="")
print()
for k in range(8):
print('# ',' '*16,'#',sep="")
for j in range(10):
print('# ',end="")

Python_01Day_ practice