打招呼

print("你好 世界")

输出各类字面量

整数字面量

print(666)

浮点数字面量

print(13.14)

字符串字面量

print("黑马程序员")

定义一个变量 用来记录钱包余额

money = 50 print("钱包还有：", money)

买了冰淇淋 用了十元

money = money-10 print('买了一个冰淇淋10元，还剩余:',money,"元")

每隔一小时，输出钱包余额

print("现在是下午1点，钱包剩余：",40) print("现在是下午2点，钱包剩余：",40) print("现在是下午3点，钱包剩余：", money) print("现在是下午4点，钱包剩余：",money) print(type("黑马程序员")) print(type(13.45)) print(type(666)) str_type = type("黑马") int_type = type(666) float_type = type(11.34) print(str_type) print(int_type) print(float_type) int(float_type) float(int_type) float_str = str(11.345) print(type(float_str), float_str) num_str = str(11) print(type(num_str), num_str) num = int('11') print(type(num), num) num2 = float("11.345") print(type(num2), num2) int_num = int(11.234) print(type(int_num), int_num)

float_str = str(11.345) print(type(float_str), float_str) num_str = str(11) print(type(num_str), num_str)

num = int('11')

print(type(num), num) num2 = float("11.345") print(type(num2), num2) int_num = int(11.234) print(type(int_num), int_num)

数学运算符

print(" 1 + 1 = ", 1 + 1) print(" 2 - 1 = ", 2 - 1) print(" 3 * 3 = ", 3 * 3) print(" 4 / 2 = ", 4 / 2) print(" 11 // 2 = ", 11 // 2) print(" 9 % 2 = ", 9 % 2 ) print(" 2 ** 2 = ", 2 ** 2 ) print("num = 1 + 2 *3", num) print("num = 1", num) print("num += 1", num)

num = 1 + 2 * 3 num = 1 num += 1 print("num += 1:", num) num -= 1 print("num -= 1:", num) num *= 4 print("num *= 4:", num) num /= 2 print("num /= 2", num) num = 3 num %= 2 print("num %= 2", num) num **= 2 print("num **= 2", num) num = 9 num //= 2 print("num //=2", num)

name = "黑马程序员" print(type(name)) name = '黑马' print(type(name)) name = """ 我是 黑马 程序员""" print(type(name)) name = ("'黑马程序员") print(name)

字符串拼接

print("学IT来黑马", "月薪过万") name = "黑马程序员" address = "建材东路9号" tel = "4006189090" print("我是：" + name + ",我的地址是：" + address + ",我的电话是：" + tel)

字符串格式化

name = "黑马程序员" message = "学IT就来 %s " % name print(message) class_num = 57 avg_salary = 16781 message = "python大数据学科，北京%s期，毕业平均工资：%s" % (class_num, avg_salary) print(message) name = "传智播客" set_up_year = 2006 stock_price = 19.99 message = "我是：%s，我成立于： %d，我今天的股价是：%.2f" % (name, set_up_year, stock_price) print(message) num1 = 11 num2 = 11.345 print("数字11宽度限制5，结果:%5d" % num1) print("数字11宽度限制1，结果:%1d" % num1) print("数字11.345宽度限制7，小数精度2，结果:%7.2f" % num2) print("数字11.345不限制，小数精度2，结果:%.2f" % num2)

name = "傳智播客" set_up_year = 2006 stock_price =19.99 print(f"我是{name},我成立於：{set_up_year}年，我今天的股價是：{stock_price}") print("1 * 1的結果是：%d" % (1 * 1)) print(f"1 * 2的結果是: {1 * 2}") print("字符串在python中的類型是：%s" % type("字符串"))

name = "傳智播客" stock_price = 19.99 stock_code = "003032" stock_price_daily_growth_factor = 1.2 growth_days = 7 stock_price1 = stock_price * stock_price_daily_growth_factor ** growth_days print(f"公司：{name},股票代碼：{stock_code},當前股價:{stock_price}") print("每日增長係數是：%.2f,經過%d的增長后，股價達到了：%.2f" % (stock_price_daily_growth_factor, growth_days, stock_price1)) name = input("請告訴我你是誰？") print("我知道了，你是%s，歡迎回來！" % name) num = input("請告訴我你的銀行卡密碼：") num = int(num) print("你的銀行卡密碼類型是：", type(num))

print("您好：") user_name = input() user_type = input("請輸入您的用戶類型：") welcome_message = "您好：%s，您是尊貴的：%s用戶，歡迎您的光臨。" % (user_name, user_type) print(welcome_message)