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为啥if a = 0:会报错SyntaxError:invalid syntax（无效语句）

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Like_枫叶_560

#1 Created at ... [Delete] [Delete and Lock User]

import math

def quadratic(a,b,c):

if a = 0:
    print('二元方程式a不能为零')
if b * b - 4 * a * c >= 0:
    x1 = (-b + math.sqrt(b * b - 4 * a * c))/2 * a
    x2 = (-b - math.sqrt(b * b - 4 * a * c))/2 * a
    return x1,x2
else:
    print('二元次方程式不成立！')

print(quadratic(3,4,1)) print(quadratic(1,3,-4))

为啥if a = 0:会提示这个，如下：

SyntaxError:invalid syntax（无效语句）

廖雪峰

#2 Created at ... [Delete] [Delete and Lock User]

if a==0:

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