我试图编写一个计算器来用Python计算公式，但是我的elif语句出现语法错误。我在这里和其他站点上检查了其他几篇文章，但似乎人们犯的错误与我不同。谢谢您的帮助！:)这是我的代码：
# IMPORTS
import os
import math
# SELECTION
print ("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~")
print ("~~~ PYTHAGOREAN THEOROM CALCULATOR ~~~")
print ("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~")
print ("OPTIONS:")
print ("1 - SOLVE FOR HYPOTENUSE")
print ("2 - SOLVE FOR LEG")
print ("3 - SOLVE FOR LEG 2")
user_choice = input("ENTER YOUR CHOICE: ")
# HYPOTENUSE MATHEMATICS
if user_choice == "1":
firstnh = int(input("ENTER YOUR FIRST LEG'S DIMENSION: "))
secondnh = int(input("ENTER YOUR SECOND LEG'S DIMENSION: "))
secondsteph = (firstnh ** 2 + secondnh **2)
hanswer = math.sqrt(secondsteph)
print (hanswer , "IS YOUR ANSWER")
input()
os.system('cls')
# LEG 1 MATHEMATICS
elif user_choice == "2":
firstnl = int(input("ENTER YOUR LEG: "))
secondnl = int(input("ENTER YOUR HYPOTENUSE: "))
secondstepl = (secondnl ** 2 - firstnl ** 2)
lanswer = math.sqrt(secondstepl)
print (lanswer, "IS YOUR ANSWER")
input()
os.system('cls')
错误在这里：
# LEG 1 MATHEMATICS
elif user_choice == "2": < - - - ERROR HERE
firstnl = int(input("ENTER YOUR LEG: "))
secondnl = int(input("ENTER YOUR HYPOTENUSE: "))
secondstepl = (secondnl ** 2 - firstnl ** 2)
lanswer = math.sqrt(secondstepl)
print (lanswer, "IS YOUR ANSWER")
input()
os.system('cls')
这就是IDE所说的：
elif user_choice == "2":
^
SyntaxError: invalid syntax
您的用法是错误的，该elif语句只能在if语句之后使用。
if user_choice == "1":
firstnh = int(input("ENTER YOUR FIRST LEG'S DIMENSION: "))
secondnh = int(input("ENTER YOUR SECOND LEG'S DIMENSION: "))
这部分仅在if声明中。从一行secondsteph = (firstnh ** 2 + secondnh **2)开始，它是一个新的代码块，而不是if块。如果这是缩进错误，请尝试：
if user_choice == "1":
firstnh = int(input("ENTER YOUR FIRST LEG'S DIMENSION: "))
secondnh = int(input("ENTER YOUR SECOND LEG'S DIMENSION: "))
secondsteph = (firstnh ** 2 + secondnh **2)
hanswer = math.sqrt(secondsteph)
print (hanswer , "IS YOUR ANSWER")
input()
os.system('cls')
# LEG 1 MATHEMATICS
elif user_choice == "2":
firstnl = int(input("ENTER YOUR LEG: "))
secondnl = int(input("ENTER YOUR HYPOTENUSE: "))
如果没有，请放置语句，
secondsteph = (firstnh ** 2 + secondnh **2)
hanswer = math.sqrt(secondsteph)
print (hanswer , "IS YOUR ANSWER")
input()
os.system('cls')
后elif块
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我来说两句