Here are three ways to draw a straight line in python: 1. Using the list comprehension method, you only need to add a variable of data type, and then add a series of straight lines on it to get a straight line. 5. Use the combination of loop analysis method and for loop analysis method to draw a straight line, and you can get a straight line.
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1. List analysis method
When using the list comprehension method to draw a straight line, we can first add a straight line to the list, and then draw the line through the list comprehension method. First, we need to create a variable called "slice_list", which is of type list and contains a series of string variables. Next, we need to create a series of lines (Figure 1). In order to get a straight line, we only need to add a series of string variables such as "-", "++" to the slice_list variable (as shown in Figure 2). We can then draw this line by looping through each element in the list. When using the loop analysis method to draw a straight line, we only need to assign a value to the slice_list variable. The following is the code for drawing a straight line using the circular analysis method: Next, we can get all the elements in the list through the variable slice_list. When we need to draw a straight line, we only need to add a straight line to the slice_list (as shown in Figure 4). Of course, we can also use the list comprehension method to draw a curve, as follows:
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Second, the circular analysis method
Loop parsing is a programming technique. In Python, parse a list into an array, then add the elements in the array to the list one by one, and finally return the array to get a straight line. The execution process of the circular analysis method is as follows: Add a variable named x_list in the function, and assign the value of this variable to a variable a of digital type; then add a series of numbers in the middle of the list, and add them to the bottom ;Finally use a for loop to complete all the lines. The function provides two parameters: x, y; where x and y are variables of the numeric type, and x and y are the corresponding numbers behind the numeric variable. If you want to get a straight line, you only need to specify x and y as the values to be drawn. If you want to get a straight line, use a for loop to draw all the straight lines. First add a number type variable x_list to the list; then add an integer type variable y to the list; finally use the for loop to complete the drawing of all lines. It should be noted here: Although two parameters x and y are provided in Python, each time a for loop is used to draw a straight line, a numeric type variable is obtained from the last array to set the default value, so each drawing For straight lines, the first array needs to be specified first.
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Three, for loop analysis method
The for loop analysis method mentioned here refers to using the for loop to complete the task of drawing a straight line when drawing a straight line. Example: We want to draw a horizontal straight line. Just add a variable in the program, and then use the for loop to complete this series of operations: For example: Enter the variable name "row", and then use the for loop to draw a straight line: Note: We use the for loop to draw a straight line , for each repetition, a new list variable is created. For each new list variable, it will be assigned the value 0. Therefore, when drawing a straight line, we must pay attention to what variables are used for each drawing. The above three methods of drawing a straight line have their own advantages and disadvantages, and you can choose according to different situations: The above are the three methods of drawing a straight line. In actual programming, you can choose which method to use according to your actual situation.
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1. My God, drawing a straight line is so easy
In fact, in python, drawing a straight line is also very simple, as long as there are only a few functions used, so drawing a straight line in python only needs to realize the function of drawing a straight line. Through the above code, we can see that the whole process only needs three functions: In the function of drawing a straight line, there are two parameters: one is the straight line to be drawn, and the other is the length of the straight line to be drawn. The function of drawing a straight line is responsible for the function of drawing a straight line. Through this function, we can see that we only need to add a variable "row" in the code to realize the function of drawing a straight line. These two functions are separated and complete their corresponding tasks respectively. Let's take a look at the specific code implementation: The above code realizes the function of drawing a straight line, but it is not perfect, and another function needs to be added.
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2. How does Python's drawer realize the straight line drawing function
Python's drawer provides two functions, one is to draw a line, and the other is to draw a rectangle. In actual programming, we can use these two functions to complete some simple straight line drawing tasks. For example: if you want to draw a horizontal line, you can use drawer to complete this task. Let's demonstrate how to use drawer to draw a horizontal line. First of all, we need to set the style of "line" in the drawer, and then set the start point and end point of the line, and whether to use the two data items of start point and end point. It should be noted here that in the drawer, two data items, the start point and the end point, are used by default. Therefore, when drawing a straight line, the start point and end point need to be changed.
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Fourth, the combination of loop analysis method and for loop analysis method
Combining the loop analysis method and the for loop analysis method, you can get a straight line, and then assign the length of the line to a variable, and then use the for loop method to continue drawing the straight line into a straight line. Let's first look at what the straight lines drawn by these three methods look like. Among the above three methods, the list analysis method draws a straight line, the for loop analysis method draws two straight lines, and the combination of the loop analysis method and the for loop analysis method draws three straight lines. The straight lines drawn by these three methods have one characteristic: they are all composed of a series of points, but the coordinates of each point are different. However, the straight lines drawn using the list analysis method and the for loop analysis method are each composed of countless points, which causes them to repeat when they finally get the straight line. The loop analysis method and the for loop analysis method are combined. After drawing a line each time, you can save it to the list first, and then draw the line again. This avoids duplication of lines. Let's take a look at the differences between them: Among the above three methods, the loop analysis method and the for loop analysis method complete three line drawing operations in one statement. In the list comprehension method, three line-drawing operations are completed in two statements.
The following are several commonly used codes for drawing straight lines in Python:
1. Use the matplotlib library to draw a straight line:
```python
import matplotlib.pyplot as plt
# Define the starting and ending coordinates of the line
x1, y1 = 0, 0
x2, y2 = 5, 5
# Draw a straight line
plt.plot([x1, x2], [y1, y2])
# Display graphics
plt.show()
```
2. Use the turtle library to draw straight lines:
```python
import turtle
# Create canvas and brush
canvas = turtle.Screen()
pen = turtle. Turtle()
# Define the starting and ending coordinates of the line
x1, y1 = 0, 0
x2, y2 = 100, 100
# Move the pen to the starting point
pen.penup()
pen.goto(x1, y1)
pen.pendown()
# draw Straight line
pen.goto(x2, y2)
# hide the brush
pen.hideturtle()
# close the canvas
canvas.exitonclick()
```
3. Use the OpenCV library to draw a straight line:
```python
import cv2
# Create a black image
img = np.zeros((512, 512, 3), np.uint8)
# Define the starting and ending coordinates of the line
x1, y1 = 0, 0
x2, y2 = 500, 500
# Draw a straight line
cv2.line(img, (x1, y1), (x2, y2), (255, 0, 0), 5)
# Display image
cv2.imshow("image", img)
cv2.waitKey(0)
cv2.destroyAllWindows()
```