Question

“为什么 sin 无效，它给我一个语法错误？我在python 3.6中编写了一个科学计算器

from tkinter import *
from tkinter import ttk
from math import*

class Calculator:
    calc_value = 0.0
    div_trigger = False
    mult_trigger = False
    add_trigger = False
    sub_trigger = False
    asin_trigger = False


    def button_press(self, value):
        entry_val = self.number_entry.get()
        entry_val += value
        self.number_entry.delete(0, "end")
        self.number_entry.insert(0, entry_val)


    def isfloat(self, str_val):
        try:
            float(str_val)
            return True
        except ValueError:
            return False


    def math_button_press(self, value):
        if self.isfloat(str(self.number_entry.get())):
            self.add_trigger = False
            self.sub_trigger = False
            self.mult_trigger = False
            self.div_trigger = False
            self.asin_trigger = False
            self.calc_value = float(self.entry_value.get())
            if value == "/":
                print("/ Pressed")
                self.div_trigger = True
            elif value == "*":
                print("* Pressed")
                self.mult_trigger = True
            elif value == "+":
                print("+ Pressed")
                self.add_trigger = True
            elif value == "sin":
                print("sin Pressed")
                self.asin_trigger = True 
            else:
                print("- Pressed")
                self.sub_trigger = True
            self.number_entry.delete(0, "end")


    def equal_button_press(self):  
        if self.add_trigger or self.sub_trigger or self.mult_trigger or self.div_trigger or self.asin_trigger:

            if self.add_trigger:
                solution = self.calc_value + float(self.entry_value.get())
            elif self.sub_trigger:
                solution = self.calc_value - float(self.entry_value.get())
            elif self.mult_trigger:
                solution = self.calc_value * float(self.entry_value.get())
            elif self.asin_trigger:
                solution = self.calc_value sin float(self.entry_value.get())
            else:
                solution = self.calc_value / float(self.entry_value.get())

            print(self.calc_value, " ", float(self.entry_value.get()),
                                            " ", solution)

            #
            self.number_entry.delete(0, "end")

            self.number_entry.insert(0, solution)


    def __init__(self, root):
        self.entry_value = StringVar(root, value="")
        root.title("Calculator")
        root.geometry("860x440")
        root.resizable(width=False, height=False)
        style = ttk.Style()
        style.configure("TButton",
                        font="Serif 15",
                        padding=10)

        style.configure("TEntry",
                        font="Serif 18",
                        padding=10)

        # Create the text entry box
        self.number_entry = ttk.Entry(root,
                        textvariable=self.entry_value, width=50)
        self.number_entry.grid(row=0, columnspan=4)

        # ----- 1st Row -----

        self.button7 = ttk.Button(root, text="7", command=lambda: self.button_press('7')).grid(row=1, column=0)

        self.button8 = ttk.Button(root, text="8", command=lambda: self.button_press('8')).grid(row=1, column=1)

        self.button9 = ttk.Button(root, text="9", command=lambda: self.button_press('9')).grid(row=1, column=2)

        self.button_div = ttk.Button(root, text="/", command=lambda: self.math_button_press('/')).grid(row=1, column=3)

        # ----- 2nd Row -----

        self.button4 = ttk.Button(root, text="4", command=lambda: self.button_press('4')).grid(row=2, column=0)

        self.button5 = ttk.Button(root, text="5", command=lambda: self.button_press('5')).grid(row=2, column=1)

        self.button6 = ttk.Button(root, text="6", command=lambda: self.button_press('6')).grid(row=2, column=2)

        self.button_mult = ttk.Button(root, text="*", command=lambda: self.math_button_press('*')).grid(row=2, column=3)

        # ----- 3rd Row -----

        self.button1 = ttk.Button(root, text="1", command=lambda: self.button_press('1')).grid(row=3, column=0)

        self.button2 = ttk.Button(root, text="2", command=lambda: self.button_press('2')).grid(row=3, column=1)

        self.button3 = ttk.Button(root, text="3", command=lambda: self.button_press('3')).grid(row=3, column=2)

        self.button_add = ttk.Button(root, text="+", command=lambda: self.math_button_press('+')).grid(row=3, column=3)

        # ----- 4th Row -----

        self.button_clear = ttk.Button(root, text="AC", command=lambda: self.button_press('AC')).grid(row=4, column=0)

        self.button0 = ttk.Button(root, text="0", command=lambda: self.button_press('0')).grid(row=4, column=1)

        self.button_equal = ttk.Button(root, text="=", command=lambda: self.equal_button_press()).grid(row=4, column=2)

        self.button_sub = ttk.Button(root, text="-", command=lambda: self.math_button_press('-')).grid(row=4, column=3)

        #------- 5th Row -------
        self.button_asin = ttk.Button(root, text="sin", command=lambda: self.math_button_press('sin')).grid(row=5, column=0)

root = Tk()

calc = Calculator(root)

root.mainloop()

Answer 1

在equal_button_press函数中，写一下：

elif self.asin_trigger:
    solution = sin(float(self.calc_value))   # the sine of x is given by sin(x)

然后：

# remove float() to prevent crashing when the Entry box is empty
print(self.calc_value, " ", self.entry_value.get(), " ", solution)

Python GUI tkinter科学计算器

1 个答案: