Python学习笔记（1）

import math

for i in range(50,100+1):
    for j in range(2,int(math.sqrt(i))+1):
        if i%j==0:
            break
    else:
        print(i)

import math
def quad(a,b,c):
    if not isinstance(a,(int,float)) and isinstance(b,(int,float)) and isinstance(c,(int,float)):
        raise TypeError(‘bad operand type‘)
        return ‘ABC\‘re Error‘
    else:
        if a==0 and b!=0:
            return (-c)/b
        elif a==0 and b==0:
            return ‘ABC\‘re Error‘
        else:
            m=b*b-4*a*c
            if m>=0:
                x1=(-b+math.sqrt(m))/(2*a)
                x2=(-b-math.sqrt(m))/(2*a)
                if x1==x2:
                    return x1
                else:
                    return x1,x2
            else:
                return complex((-b)/(2*a),(math.sqrt(-m))/(2*a)),complex((-b)/(2*a),-(math.sqrt(-m))/(2*a))

a=int(input(‘plz input a:‘))
b=int(input(‘plz input b:‘))
c=int(input(‘plz input c:‘))
s=quad(a,b,c)
print(s)