If 語句行收到語法錯誤 (Syntax Error received on If statement line)

問題描述

If 語句行收到語法錯誤 (Syntax Error received on If statement line)

我在編輯器中收到一個錯誤（在運行 py 文件後再次在控制台中，在控制台中描述為 SyntaxError）在包含 If 語句的行上

下面的代碼是包含在文件中

if a = 4:
    b = 1
if a = 4:
    b = 1
if a = 4:
    b = 1

代碼本身是多餘的，但錯誤僅在第一行顯示（在編輯器中），而不是其他行。當其他代碼相同時，僅在第一行代碼上導致此錯誤的原因是什麼？

參考解法

方法 1:

The if statement evaluates a boolean expression. if a = 4 is not a boolean expression in python. You have to use the == symbol. Try this:

if a == 4:
    b = 1
if a == 4:
    b = 1
if a == 4:
    b = 1

方法 2:

Comparison for equality is done using the == operator (you're using a single = which is for assignments only). Also, you're missing a colon:

if result == "PASS":

(by SBF12345、Eduard Voiculescu、amreshk005)

參考文件

1. Syntax Error received on If statement line (CC BY‑SA 2.5/3.0/4.0)