# 軟實作業

import numpy as np
import matplotlib.pyplot as pl
x = np.linspace(-np.pi,np.pi)
threshold = 0
y = []
for value in x:
    if value >= threshold:
       y.append(1)
    else:
       y.append(0)
pl.figure()
pl.scatter(x,y,marker='o')
pl.show()



import numpy as np
import matplotlib.pyplot as pl
x = np.linspace(-np.pi,np.pi)
threshold = 0
y = []
for value in x:
    if value >= threshold:
       y.append(value)
    else:
       y.append(0)
pl.figure()
pl.scatter(x,y,marker='o')
pl.show()




import numpy as np
import matplotlib.pyplot as pl
x = np.linspace(-np.pi,np.pi)
threshold_l = 0
threshold_h = 1
y = []
for value in x:
    if threshold_h >= value >= threshold_l:
       y.append(value)
    elif value > threshold_h:
        y.append(1)
    else:
       y.append(0)
pl.figure()
pl.scatter(x,y,marker='o')
pl.show()




import random
S = list(range(60,101))
N = 20
scores = []
for i in range(N):
  s = random.choice(S)
  scores.append(s)
grade = []
for score in scores:
  if score >= 95:
      g = 'A'
  elif score >= 90:
      g = 'B'
  elif score >= 85:
      g = 'C'
  elif score >= 80:
      g = 'D'
  elif score >= 75:
      g = 'E'
  else:
      g = 'F'
  grade.append(g)
for i in range(len(grade)):
 print(scores[i],grade[i])






import random
Dice = [i for i in range(1,7)]
while True:
     p = []
     times = 3
     for i in range(times):
        dice = random.choice(Dice)
        p.append(dice)
     print("dices",p)
     a = set(p)
     if len(a) == 1:
         print('score is 7')
         break
     elif len(a) == 2:
         for j in a:
             if p.count(j) == 1:
                print(j)
         break
     else:
         print(len(a), 'different points.')
         continue