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Python3 First day of study

function calculation

#用户输入数字

NUM1 = input (' Enter the number you want to calculate here: ')

num2 = input (' Enter a second number: ')

num3 = input (' can also input three numbers OH: ')

#计算公式

sum = float (NUM1) +float (num2) *float (num3)

#输出结果

Print (' number {0} ' and ' number ' {1} ' added multiplied by the number {2} result is: {3} '. Format (num1,num2,num3,sum))

Personal understanding

The meaning of input in English

NUM1 equivalent to defining the input function

Float is a value that is defined as a floating number

Sum is the result of a function operation

Print let the machine printing meaning

format, formatted string, {0} ...

Simplifying Code Bits

Print (' Sum of two bundles:%1.f '% (float (input (' Enter first number: ') ') +float (Input (' Enter second number: '))))

Mean

Output operation module result is%

The sum of two numbers of Chinese characters is:

%1.f a digit after the decimal point, rounded later

Operation module Within ()

To define the input (enter the first number: after) The value is a floating number

+ On the second floating number operation

Python operators

Except-X divided by y

Modulo-returns the remainder of division

valign= "to P ">

+	Plus-two objects added	A + b output results
-	minus-get negative numbers or one number minus another"	A-B output -11
*	Multiply by two numbers or return a repeated number of times The string	A * b output of the result of the
/	b/a Output 2.1
%	B% A output 1
**< /p>	Power-returns the y power of x	A**b is 10 of 21 parties
//	Divide-return the integer portion of the quotient	9//2 output result 4, 9.0//2.0 output 4.0< /p>

Extrapolate

Two ways of writing mathematical operations

First define NUM and write the sum formula to the final output format, print (' Result {0}{1} '. Format (String, String))

Simplified code for print (' Result '% (string arithmetic process))

Python3 Study the next day

Python3 instances

The square root, also called two square roots, is expressed as (√￣), such as: The Mathematical language is: √￣16=4. The language is described as: 16=4 under the square root.

The following example enters a number by the user and calculates the square root of the number:

‘‘‘

Print (' The square root of this number is:%.9f '% (float (input (' Enter a number: ')) * * 0.5))

Knowledge Point One: the reciprocal of the square root to power

The arithmetic formula is num_sqrt=num**0.5

Extension code

#定义输入数字为字符串

num= Float (input ' Enter first number: ')

#告诉运算公式

NUM_SQRT = num * * 0.5

#输出结果

Print (' {0:%.1f} ' square root is {1:%.1f} '. Format (NUM,NUM_SQRT))

#缺点没定义小数数量

#定义输入数字为字符串

num = float (input (' Enter the number to be computed: '))

#告诉运算公式

NUM_SQRT = num * * 0.5

#输出结果

Print (' The square root of the digital%.3f is%.4f '% (num, num_sqrt))

#缺点没定义小数数量

#简化公式为

Print (' The square root of the number is%.4f '% (float (input (' Enter the number to be computed: ')) * * 0.5))

# calculates real and complex square roots

# import Complex Math module

Import Cmath

num = Int (input ("Please enter a number:"))

NUM_SQRT = cmath.sqrt (num)

Print (the square root of ' {0} is {1:0.3f}+{2:0.3f}j '). Format (num, num_sqrt.real,num_sqrt.imag))

Import importing module meaning load

CAMTH Module Library's complex operation module

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