Python 代码片段 |文档

# this is a simple "hello world" program that demonstrates basic print statements# print the string "hello world" to the consoleprint("hello world")# print the integer 1 to the consoleprint(1)# print the integer 20 to the consoleprint(20)

# this program demonstrates the use of variables and string concatenation# assign the string "dipsan" to the variable _name_name = "dipsan"# assign the integer 20 to the variable _age_age = 20# assign the string "piano" to the variable _instrument_instrument = "piano"# print a sentence using string concatenation with the _name variableprint("my name is" + _name + ".")# print a sentence using string concatenation, converting _age to a stringprint("i'm" + str(_age) + "years old")  # converting int to string for concatenation# print a simple stringprint("i dont like hanging out")# print a sentence using string concatenation with the _instrument variableprint("i love " + _instrument + ".")

# this script demonstrates various string operations# assign a string to the variable 'phrase'phrase = "dipsansacademy"# print a simple stringprint("this is a string")# concatenate strings and print the resultprint('this' + phrase + "")# convert the phrase to uppercase and printprint(phrase.upper())# convert the phrase to lowercase and printprint(phrase.lower())# check if the uppercase version of phrase is all uppercase and print the resultprint(phrase.upper().isupper())# print the length of the phraseprint(len(phrase))# print the first character of the phrase (index 0)print(phrase[0])# print the second character of the phrase (index 1)print(phrase[1])# print the fifth character of the phrase (index 4)print(phrase[4])# find and print the index of 'a' in the phraseprint(phrase.index("a"))# replace "dipsans" with "kadariya" in the phrase and print the resultprint(phrase.replace("dipsans", "kadariya"))

# import all functions from the math modulefrom math import *  # importing math module for additional math functions# this script demonstrates various numeric operations and math functions# print the integer 20print(20)# multiply 20 by 4 and print the resultprint(20 * 4)# add 20 and 4 and print the resultprint(20 + 4)# subtract 4 from 20 and print the resultprint(20 - 4)# perform a more complex calculation and print the resultprint(3 + (4 - 5))# calculate the remainder of 10 divided by 3 and print the resultprint(10 % 3)# assign the value 100 to the variable _num_num = 100# print the value of _numprint(_num)# convert _num to a string, concatenate with other strings, and printprint(str(_num) + " is my fav number")  # converting int to string for concatenation# assign -10 to the variable new_numnew_num = -10# print the absolute value of new_numprint(abs(new_num))  # absolute value# calculate 3 to the power of 2 and print the resultprint(pow(3, 2))     # power function# find the maximum of 2 and 3 and print the resultprint(max(2, 3))     # maximum# find the minimum of 2 and 3 and print the resultprint(min(2, 3))     # minimum# round 3.2 to the nearest integer and print the resultprint(round(3.2))    # rounding# round 3.7 to the nearest integer and print the resultprint(round(3.7))# calculate the floor of 3.7 and print the resultprint(floor(3.7))    # floor function# calculate the ceiling of 3.7 and print the resultprint(ceil(3.7))     # ceiling function# calculate the square root of 36 and print the resultprint(sqrt(36))      # square root

# this script demonstrates how to get user input and use it in string concatenation# prompt the user to enter their name and store it in the 'name' variablename = input("enter your name : ")# prompt the user to enter their age and store it in the 'age' variableage = input("enter your age. : ")# print a greeting using the user's input, concatenating stringsprint("hello " + name + " youre age is " + age + " .")

# this script creates a basic calculator that adds two numbers# prompt the user to enter the first number and store it in 'num1'num1 = input("enter first number : ")# prompt the user to enter the second number and store it in 'num2'num2 = input("enter second number: ")# convert the input strings to integers and add them, storing the resultresult = int(num1) + int(num2)# print the result of the additionprint(result)

# this program is used to create a simple mad libs game.# prompt the user to enter an adjective and store it in 'adjective1'adjective1 = input("enter an adjective: ")# prompt the user to enter an animal and store it in 'animal'animal = input("enter an animal: ")# prompt the user to enter a verb and store it in 'verb'verb = input("enter a verb: ")# prompt the user to enter another adjective and store it in 'adjective2'adjective2 = input("enter another adjective: ")# print the first sentence of the mad libs story using string concatenationprint("i have a " + adjective1 + " " + animal + ".")# print the second sentence of the mad libs storyprint("it likes to " + verb + " all day.")# print the third sentence of the mad libs storyprint("my " + animal + " is so " + adjective2 + ".")

# this script demonstrates basic list operations# create a list of friends' namesfriends = ["roi", "alex", "jimmy", "joseph"]# print the entire listprint(friends)# print the first element of the list (index 0)print(friends[0])# print the second element of the list (index 1)print(friends[1])# print the third element of the list (index 2)print(friends[2])# print the fourth element of the list (index 3)print(friends[3])# print the last element of the list using negative indexingprint(friends[-1])# print a slice of the list from the second element to the endprint(friends[1:])# print a slice of the list from the second element to the third (exclusive)print(friends[1:3])# change the second element of the list to "kim"friends[1] = "kim"# print the modified listprint(friends)

# this script demonstrates various list functions and methods# create a list of numbersnumbers = [4, 6, 88, 3, 0, 34]# create a list of friends' namesfriends = ["roi", "alex", "jimmy", "joseph", "kevin", "tony", "jimmy"]# print both listsprint(numbers)print(friends)# add all elements from 'numbers' to the end of 'friends'friends.extend(numbers)# add "hulk" to the end of the 'friends' listfriends.append("hulk")# insert "mikey" at index 1 in the 'friends' listfriends.insert(1, "mikey")# remove the first occurrence of "roi" from the 'friends' listfriends.remove("roi")# print the index of "mikey" in the 'friends' listprint(friends.index("mikey"))# remove and print the last item in the 'friends' listprint(friends.pop())# print the current state of the 'friends' listprint(friends)# remove all elements from the 'friends' listfriends.clear()# print the empty 'friends' listprint(friends)# sort the 'numbers' list in ascending ordernumbers.sort()# print the sorted 'numbers' listprint(numbers)

# this script introduces tuples and their immutability# create a tuple with two elementsvalues = (3, 4)# print the entire tupleprint(values)# print the second element of the tuple (index 1)print(values[1])# the following line would cause an indexerror if uncommented:# print(values[2])  # this would cause an indexerror# the following line would cause a typeerror if uncommented:# values[1] = 30    # this would cause a typeerror as tuples are immutable# the following line would print the modified tuple if the previous line worked:# print(values)

# this script demonstrates how to define and call functions# define a function called 'greetings' that prints two linesdef greetings():    print("hi, welcome to programming world of python")    print("keep learning")# print a statement before calling the functionprint("this is first statement")# call the 'greetings' functiongreetings()# print a statement after calling the functionprint("this is last statement")# define a function 'add' that takes two parameters and prints their sumdef add(num1, num2):    print(int(num1) + int(num2))# call the 'add' function with arguments 3 and 4add(3, 4)

# this script demonstrates the use of return statements in functions# define a function 'square' that returns the square of a numberdef square(num):    return num * num    # any code after the return statement won't execute# call the 'square' function with argument 2 and print the resultprint(square(2))# call the 'square' function with argument 4 and print the resultprint(square(4))# call the 'square' function with argument 3, store the result, then print itresult = square(3)print(result)

# this script demonstrates the use of if-elif-else statements# set boolean variables for conditionsis_boy = trueis_handsome = false# check conditions using if-elif-else statementsif is_boy and is_handsome:    print("you are a boy & youre handsome")    print("hehe")elif is_boy and not (is_handsome):    print("youre a boy but sorry not handsome")else:    print("youre not a boy")

# this script demonstrates comparison operations in if statements# define a function to find the maximum of three numbersdef max_numbers(num1, num2, num3):    if num1 >= num2 and num1 >= num3:        return num1    elif num2 >= num1 and num2 >= num3:        return num2    else:        return num3# test the max_numbers function with different inputsprint(max_numbers(20, 40, 60))print(max_numbers(30, 14, 20))print(max_numbers(3, 90, 10))print("for min_number")# define a function to find the minimum of three numbersdef min_numbers(num1, num2, num3):    if num1 <= num2 and num1 <= num3:        return num1    elif num2 <= num1 and num2 <= num3:        return num2    else:        return num3# test the min_numbers function with different inputsprint(min_numbers(20, 40, 60))print(min_numbers(30, 14, 20))print(min_numbers(3, 90, 10))

# this script improves the guessing game with more featuresimport random# generate a random number between 1 and 20secret_number = random.randint(1, 20)# initialize the number of attempts and set a limitattempts = 0attempt_limit = 5# loop to allow the user to guess the numberwhile attempts < attempt_limit:    guess = int(input(f"guess the number (between 1 and 20). you have {attempt_limit - attempts} attempts left: "))    if guess == secret_number:        print("congratulations! you guessed the number!")        break    elif guess < secret_number:        print("too low!")    else:        print("too high!")    attempts += 1# if the user does not guess correctly within the attempt limit, reveal the numberif guess != secret_number:    print(f"sorry, the correct number was {secret_number}.")

# list of numbersnumbers = [1, 2, 3, 4, 5]# iterate over each number in the listfor number in numbers:    # print the current number    print(number)# output:# 1# 2# 3# 4# 5# list of friendsfriends = ["roi", "alex", "jimmy", "joseph", "kevin", "tony", "jimmy"]# iterate over each friend in the listfor friend in friends:    # print the name of the current friend    print(friend)# output:# roi# alex# jimmy# joseph# kevin# tony# jimmy# use range to generate numbers from 0 to 4for num in range(5):    print(num)# output:# 0# 1# 2# 3# 4

# this script demonstrates the use of the exponential functiondef exponentialfunction(base,power):    result = 1    for index in range(power):        result = result * base    return resultprint(exponentialfunction(3,2))print(exponentialfunction(4,2))print(exponentialfunction(5,2))#or you can power just byprint(2**3) #number *** power

# This script demonstrates the use of 2D List and For Loops# Define a 2D list (list of lists)num_grid = [    [1, 2, 3],  # Row 0: contains 1, 2, 3    [4, 5, 6],  # Row 1: contains 4, 5, 6    [7, 8, 9],  # Row 2: contains 7, 8, 9    [0]         # Row 3: contains a single value 0]# Print specific elements in num_gridprint(num_grid[0][0])   # Print value in the zeroth row, zeroth column (value: 1)print(num_grid[1][0])   # Print value in the first row, zeroth column (value: 4)print(num_grid[2][2])   # Print value in the second row, second column (value: 9)print("using nested for loops")for row in num_grid :   for col in row:    print(col)