if True:
    print('ahah, u r right!')
else:
    print('what r u fucking doing?')

#一个去年数据统计中我用来判断成绩等第的例子：
import pandas as pd
def get_letter_grade(score):
    if score>=90:
        return "A"
    elif score>=80:
        return "B"
    elif score>=70:
        return "C"
    elif score>=60:
        return "D"
    else:
        return "F"
df=pd.read_csv('big file.csv')

df['letter grade']=df['final grade'].apply(lambda x: get_letter_grade(x))

df.to_csv('big file.csv',index=False)

df.head(10)

# 关于缩进语句的嵌套（python和java不同没有{}的嵌套限制，所有有严格的缩进要求）
gender = 1#1为男生，0为女生
issingle = 1#是单身，0不是单身
if gender == 1:
    print('这是个男孩子')
    #在该条件下if
    if(issingle == 1):
        print('为你感到惋惜')
    else:
        print('滚')
else:
    print('这是个女孩子')
    if(issingle == 1):
        print('为你感到惋惜')
    else:
        print('祝你幸福')

# 引入包进行random运算,randint函数取得是范围内的整数()包括边界
import random 
#或者写from...import。from random import randint
x = random.randint(0,2)
print(x)

# 随堂作业：剪刀石头布程序import random
user = 0
pc = 0

x = int(input("请输入：剪刀(0)、石头(1)、布(2):"))
if x == 0:
    user = "剪刀"
elif x == 1:
    user = "石头"
elif x == 2:
    user = "布"

t = random.randint(0, 2)
if t == 0:
    pc = "剪刀"
elif t == 1:
    pc = "石头"
elif t == 2:
    pc = "布"

if x in (0, 1, 2):
    if (x - t) in (1, -2):
        print("您出的是：", user, "，电脑出的是：", pc, "，因此您赢了！", sep="")
    elif x == t:
        print("您出的是：", user, "，电脑出的是：", pc, "，因此平局！", sep="")
    else:
        print("您出的是%s，电脑出的是%s，因此您输了！" % (user, pc))
else:
    print('输入无效，请检查')