摘要：if condition_1: statement_block_1 elif condition_2: statement_block_2 else: statement_block_3 var1 = 100 if var1: print ("1 - if 表达式条件为 true") print (var1) var2 = 0 if var2: ... 阅读全文

摘要：fruits = {"apple", "banana", "cherry"} fruits.add("orange") print(fruits) fruits = {"apple", "banana", "cherry"} fruits.clear() print(fruits) fruits = {"apple", "banana", "cherry"} x = fruits.co... 阅读全文

摘要：dict = {'Alice': '2341', 'Beth': '9102', 'Cecil': '3258'} dict1 = { 'abc': 456 } dict2 = { 'abc': 123, 98.6: 37 } dict = {'Name': 'Runoob', 'Age': 7, 'Class': 'First'} print ("dict['Name& 阅读全文

摘要：tup1 = ('Google', 'Runoob', 1997, 2000) tup2 = (1, 2, 3, 4, 5, 6, 7 ) print ("tup1[0]: ", tup1[0]) print ("tup2[1:5]: ", tup2[1:5]) tup1 = (12, 34.56); tup2 = ('abc', 'xyz') # 以下修改元组元素操作是非法的。 #... 阅读全文

摘要：list1 = ['Google', 'Runoob', 1997, 2000]; list2 = [1, 2, 3, 4, 5 ]; list3 = ["a", "b", "c", "d"]; list1 = ['Google', 'Runoob', 1997, 2000]; list2 = [1, 2, 3, 4, 5, 6, 7 ]; print ("list1[0]: ", li... 阅读全文

摘要：var1 = 'Hello World!' var2 = "Runoob" #!/usr/bin/python3 var1 = 'Hello World!' var2 = "Runoob" print ("var1[0]: ", var1[0]) print ("var2[1:5]: ", var2[1:5]) #!/usr/bin/python3 var1 = 'Hello... 阅读全文

摘要：print ("abs(-40) : ", abs(-40)) print ("abs(100.10) : ", abs(100.10)) #!/usr/bin/python3 import math # 导入 math 模块 print ("math.ceil(-45.17) : ", math.ceil(-45.17)) print ("math.ceil(100.12) : ",... 阅读全文

摘要：#!/usr/bin/python3 a = 21 b = 10 c = 0 c = a + b print ("1 - c 的值为：", c) c = a - b print ("2 - c 的值为：", c) c = a * b print ("3 - c 的值为：", c) c = a / b print ("4 - c 的值为：", c) c = a % b pr... 阅读全文

摘要：#!/usr/bin/python3 counter = 100 # 整型变量 miles = 1000.0 # 浮点型变量 name = "runoob" # 字符串 print (counter) print (miles) print (name) #!/usr/bin/python3 str = 'Runoob' pri... 阅读全文

摘要：#!/usr/bin/python3 # 第一个注释 print ("Hello, Python!") # 第二个注释 #!/usr/bin/python3 # 第一个注释 # 第二个注释 ''' 第三注释 第四注释 ''' """ 第五注释 第六注释 """ print ("Hello, Python!") if True: print ("True") els... 阅读全文