Python 打印金字塔技术的程序

Python提供了用于打印图案的基本for循环。第一个外层循环管理行的数量，而内部嵌套循环管理列的数量。通过修改打印语句，可以打印新的数字图案、单词图案和星星图案。

本文说明了其中的几个图案。

1.简单的金字塔模式

# Python 3.x code for star pattern demonstration Printing pattern demonstration #function
def pypart(a):
    # outer loop in this case to manage the number of rows
    for i in range(0, a):
        # Inner loop to manage values changing according to the outer loop's number # of columns.
        for j in range(0, i+1):
            # printing up stars
            print("* ",end="")
        # final line following each row
        print("\r")
# Driver Code
a = 5
pypart(a)

输出

* 
* * 
* * * 
* * * * 
* * * * *

2.Python 3的List功能会使这个过程更简单

# Star pattern demonstration in Python 3.x # Displays a printing pattern in action
def pypart(a):
    myList1 = []
    for i in range(1, a+1):
        myList.append("*"*i)
    print("\n".join(myList1))
# Driver Code
a = 5
pypart(a)

输出

*
**
***
****
*****

3.递归法

# Pyramid pattern printing in Python 3 using recursion
def pypart(a):
    if a == 0:
        return
    else:
        pypart(a-1)
        print("* "*a)
# Driver Code
n = 5
pypart(n)

输出

* 
* * 
* * * 
* * * * 
* * * * *

4.使用While Loop

# Pyramid pattern printing in Python 3 with while loop
a=5
i=1; j=0
# Until the condition becomes false in the while loop, the condition is checked. # If it is true, enter the loop & print the pattern.
while(i<=a):
    while(j<=i-1):
        print("* ",end="")
        j+=1
     # printing the subsequent row's line
    print("\r")
    j=0;i+=1

输出

* 
* * 
* * * 
* * * * 
* * * * *

5.180度的旋转法

# Star pattern demonstration in Python 3.x # Displays a printing pattern in action
def pypart2(a):
    # number of spaces
    s = 2*s - 2
    # row count is handled by an outer loop.
    for i in range(0, a):
# inner loop for handling number spaces and changing values in accordance with # requirements
        for j in range(0, s):
            print(end=" ")
        # decrementing s after each loop
        s = s - 2
        # Inner loop to handle the amount of columns and any values that change 
# according to the outer loop.
        for n in range(0, m+1):
            # printing up stars
            print("* ", end="")
        # ending up the line after each row
        print("\r")
# Driver Code
a = 5
pypart2(a)

输出

        * 
      * * 
    * * * 
  * * * * 
* * * * *

6.三角形印刷

# Star pattern demonstration in Python 3.x 
# Triangle serving as an example of a printing pattern
def triangle(s):
    # Number of spaces to be noted
    a = b - 1
    # Outer loop to handle number of rows
    for m in range (0, b):
        # inner loop to handle number spaces
        # values changing acc. to requirement
        for n in range(0, a):
            print(end=" ")
        # decrementing a after each loop
        a = a - 1
# To handle the number of columns and the changing values according to the
 # outer loop, use an inner loop.
        for n in range(0, m+1):
            # printing up the stars
            print("* ", end="")
        # ending the line after each the row
        print("\r")
# Driver Code
b = 5
triangle(b)

输出

   * 
   * * 
  * * * 
 * * * * 
* * * * *

7.数字模式

# Star pattern demonstration in Python 3.x Function to display the number 
def numpat(s):  
    # Initialising of starting number
    num = 1
    # outer loop to be handle number of rows
    for m in range(0, n):
        # re assigning num1
        Num1 = 1
        # inner loop to be handled  at number of columns
        # values changing to acc. to outer loop
        for n in range(0, m+1): 
                # printing up number
            print(num1, end=" ")
            # incrementing the number at each column
            Num1 = num1 + 1
        # ending up line after each row
        print("\r")
# Driver code
s = 5
numpat(s)

输出