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
+ |
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 |
|
/ | valign= "to P ">
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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