这篇文章主要介绍了python3.5 + pyqt5 +eric6实现的一个计算器方法（附代码），在windows7 32位系统可以完美运行 计算器，有兴趣的可以了解一下。
目前可以实现简单的计算。计算前请重置，设计的时候默认数字是0，学了半天就做出来个这么个结果，bug不少。 python3.5 + pyqt5 +eric6 在windows7 32位系统可以完美运行 计算器，简单学了半天就画个图实现的存在bug，部分按钮还未实现，后续优化。
代码结构如图：
jisuan.py
import re
#匹配整数或小数的乘除法，包括了开头存在减号的情况
mul_p=re.compile(“(-?\d+)(\.\d+)?(\*|/)(-?\d+)(\.\d+)?”)
#匹配整数或小数的加减法，包括了开头存在减号的情况
plus_minus = re.compile(“(-?\d+)(\.\d+)?(-|\+)(-?\d+)(\.\d+)?”)
#匹配括号
bracket=re.compile(“\([^()]*\)”)
#匹配乘法的时候出现乘以负数的情况，包括了开头存在减号的情况
mul_minus_minus = re.compile(“(-?\d+)(\.\d+)?(\*-)(\d+)(\.\d+)?”)
#匹配除法的时候出现乘以负数的情况，包括了开头存在减号的情况
p_minus_minus = re.compile(“(-?\d+)(\.\d+)?(/-)(\d+)(\.\d+)?”)
#定义一个两位数的加减乘除法的运算，匹配左边的右边的数字和左边的数字，然后进行计算
def touble_cale(str_expire):
if str_expire.count(“+”) == 1:
right_num = float(str_expire[(str_expire.find(“+”)+1):])
left_num = float(str_expire[:str_expire.find(“+”)])
return str(right_num+left_num)
elif str_expire[1:].count(“-“) == 1:
right_num = float(str_expire[:str_expire.find(“-“,1)])
left_num = float(str_expire[(str_expire.find(“-“, 1) + 1):])
return str(right_num – left_num)
elif str_expire.count(“*”) == 1:
right_num = float(str_expire[:str_expire.find(“*”)])
left_num = float(str_expire[(str_expire.find(“*”)+1):])
return str(right_num * left_num)
elif str_expire.count(“/”) == 1:
right_num = float(str_expire[:str_expire.find(“/”)])
left_num = float(str_expire[(str_expire.find(“/”) + 1):])
return str(right_num / left_num)
#定义一个方法用于判断是否存在乘以负数和除以负数的情况
def judge_mul_minus(str_expire):
#判断公式中乘以负数的部分
if len(re.findall(“(\*-)”, str_expire)) != 0:
#调用上面的正则取得*-的公式
temp_mul_minus = mul_minus_minus.search(str_expire).group()
#将匹配的部分的*-换成*并将-放到前面
temp_mul_minus_2 = temp_mul_minus.replace(temp_mul_minus,”-” + temp_mul_minus.replace(“*-“,”*”))
#经更改的的部分与原来的部分进行替换
str_expire=str_expire.replace(temp_mul_minus,temp_mul_minus_2)
return judge_mul_minus(str_expire)
#return str_expire
# 判断公式中除以负数的部分
elif len(re.findall(r”(/-)”, str_expire)) != 0:
# 调用上面的正则取得/-的公式
temp_dev_minus = p_minus_minus.search(str_expire).group()
# 将匹配的部分的/-换成/并将-放到前面
temp_dev_minus_2 = temp_dev_minus.replace(temp_dev_minus,”-” + temp_dev_minus.replace(“/-“,”/”))
# 经更改的的部分与原来的部分进行替换
str_expire = str_expire.replace(temp_dev_minus,temp_dev_minus_2)
return judge_mul_minus(str_expire)
#调用change_sign将公式中的++换成= +-换成-
return change_sign(str_expire)
#定义一个方法取将–更改为+ +-改为-
def change_sign(str_expire):
if len(re.findall(r”(\+-)”, str_expire)) != 0:
str_expire = str_expire.replace(“+-“, “-“)
return change_sign(str_expire)
elif len(re.findall(r”(–)”, str_expire)) != 0:
str_expire = str_expire.replace(“–“, “+”)
return change_sign(str_expire)
return str_expire
#定义一个方法用于计算只有加减乘除的公式，优先处理乘法
def cale_mix(str_expire):
#如果公式中出现符号数字的情况即+5 -6 *8 /8的这种情况直接放回数字否则则先计算乘除在处理加减
while len(re.findall(“[-+*/]”,str_expire[1:])) != 0:
if len(re.findall(“(\*|/)”,str_expire)) != 0:
str_expire = str_expire.replace(mul_p.search(str_expire).group(),touble_cale(mul_p.search(str_expire).group()))
elif len(re.findall(“(\+|-)”,str_expire)) !=0:
str_expire = str_expire.replace(plus_minus.search(str_expire).group(),touble_cale(plus_minus.search(str_expire).group()))
return str_expire
#定义一个方法用于去括号,并调用上述的方法进行计算
def remove_bracket(str_expire):
#判断公式中是否有括号
if len(bracket.findall(str_expire)) == 0:
return cale_mix(judge_mul_minus(str_expire))
elif len(bracket.findall(str_expire))!=0:
while len(bracket.findall(str_expire)) !=0:
#print(bracket.search(str_expire).group())
#只有存在括号优先处理括号中的内容并对内容进行替换，直到没有括号位置
str_expire = str_expire.replace(bracket.search(str_expire).group(),cale_mix(judge_mul_minus(bracket.search(str_expire).group()[1:-1])))
str_expire = cale_mix(judge_mul_minus(str_expire))
return str_expire
if name == “main”:
while true:
user_input_expire = input(“请输入你的公式:(不要带空格,q表示退出):”)
print(“%s=%s” %(user_input_expire,remove_bracket(user_input_expire)))
continue
untitled.py
# -*- coding: utf-8 -*-
from pyqt5.qtcore import *
from pyqt5.qtwidgets import *
from pyqt5 import qtcore, qtgui, qtwidgets
from ui_untitled import ui_dialog
from jisuan import remove_bracket
class dialog(qdialog, ui_dialog):
def init(self, parent=none):
super(dialog, self).init(parent)
self.setupui(self)
@pyqtslot()
def on_button_6_clicked(self):
self.edit_xianshi.insertplaintext(‘6’)
@pyqtslot()
def on_button_2_clicked(self):
self.edit_xianshi.insertplaintext(‘2’)
@pyqtslot()
def on_button_3_clicked(self):
self.edit_xianshi.insertplaintext(‘3′)
@pyqtslot()
def on_button_pingfang_clicked(self):
me=self.edit_xianshi.toplaintext()
m=int(me) *int(me)
self.edit_xianshi.clear()
self.edit_xianshi.append(str(m))
@pyqtslot()
def on_button_add_clicked(self):
h=self.edit_xianshi.toplaintext()
self.edit_xianshi.clear()
self.edit_xianshi.append(h+’+’)
@pyqtslot()
def on_button_jian_clicked(self):
h = self.edit_xianshi.toplaintext()
self.edit_xianshi.clear()
self.edit_xianshi.append(h + ‘-‘)
@pyqtslot()
def on_button_9_clicked(self):
self.edit_xianshi.insertplaintext(‘9’)
@pyqtslot()
def on_button_chu_clicked(self):
h = self.edit_xianshi.toplaintext()
self.edit_xianshi.clear()
self.edit_xianshi.append(h + ‘/’)
@pyqtslot()
def on_button_cheng_clicked(self):
h = self.edit_xianshi.toplaintext()
self.edit_xianshi.clear()
self.edit_xianshi.append(h + ‘*’)
@pyqtslot()
def on_button_8_clicked(self):
self.edit_xianshi.insertplaintext(‘8’)
@pyqtslot()
def on_button_4_clicked(self):
self.edit_xianshi.insertplaintext(‘4’)
@pyqtslot()
def on_button_esc_clicked(self):
self.edit_xianshi.clear()
@pyqtslot()
def on_button_7_clicked(self):
self.edit_xianshi.insertplaintext(‘7’)
@pyqtslot()
def on_button_1_clicked(self):
self.edit_xianshi.insertplaintext(‘1’)
@pyqtslot()
def on_button_5_clicked(self):
self.edit_xianshi.insertplaintext(‘5’)
@pyqtslot()
def on_button_xiaoshu_clicked(self):
self.edit_xianshi.insertplaintext(‘.’)
@pyqtslot()
def on_button_0_clicked(self):
self.edit_xianshi.insertplaintext(‘0′)
@pyqtslot()
def on_button_dengyu_clicked(self):
pe=self.edit_xianshi.toplaintext()
m=remove_bracket(pe)
self.edit_xianshi.clear()
self.edit_xianshi.append(str(m))
def on_button_fenzhi_clicked(self):
pe = self.edit_xianshi.toplaintext()
if int(pe) ==0:
qmessagebox.information(self,u’提示’,u’零不能作为分母’)
dialog()
else:
m=1/(int(pe))
self.edit_xianshi.clear()
self.edit_xianshi.append(str(m))
dialog()
if name ==”main”:
import sys
app = qtwidgets.qapplication(sys.argv)
app.processevents()
ui = dialog()
ui.show()
sys.exit(app.exec_())
ui_untitled.py
# -*- coding: utf-8 -*-
# form implementation generated from reading ui file ‘c:\users\administrator\desktop\pyqt5\untitled.ui’
#
# created by: pyqt5 ui code generator 5.5
#
# warning! all changes made in this file will be lost!
from pyqt5 import qtcore, qtgui, qtwidgets
class ui_dialog(object):
def setupui(self, dialog):
dialog.setobjectname(“dialog”)
dialog.resize(357, 320)
dialog.setstylesheet(“font: 75 16pt \”aharoni\”;\n”
“background-color: rgb(206, 255, 251);”)
self.label = qtwidgets.qlabel(dialog)
self.label.setgeometry(qtcore.qrect(201, 210, 301, 21))
self.label.settext(“”)
self.label.setobjectname(“label”)
self.edit_xianshi = qtwidgets.qtextedit(dialog)
self.edit_xianshi.setgeometry(qtcore.qrect(0, 0, 351, 41))
self.edit_xianshi.setstylesheet(“font: 75 16pt \”aharoni\”;”)
self.edit_xianshi.setobjectname(“edit_xianshi”)
self.gridlayoutwidget = qtwidgets.qwidget(dialog)
self.gridlayoutwidget.setgeometry(qtcore.qrect(0, 30, 351, 281))
self.gridlayoutwidget.setobjectname(“gridlayoutwidget”)
self.gridlayout = qtwidgets.qgridlayout(self.gridlayoutwidget)
self.gridlayout.setobjectname(“gridlayout”)
self.button_6 = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_6.setobjectname(“button_6”)
self.gridlayout.addwidget(self.button_6, 2, 2, 1, 1)
self.button_2 = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_2.setobjectname(“button_2”)
self.gridlayout.addwidget(self.button_2, 3, 1, 1, 1)
self.button_3 = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_3.setobjectname(“button_3”)
self.gridlayout.addwidget(self.button_3, 3, 2, 1, 1)
self.button_fenzhi = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_fenzhi.setobjectname(“button_fenzhi”)
self.gridlayout.addwidget(self.button_fenzhi, 1, 3, 1, 1)
self.button_pingfang = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_pingfang.setobjectname(“button_pingfang”)
self.gridlayout.addwidget(self.button_pingfang, 0, 3, 1, 1)
self.button_add = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_add.setobjectname(“button_add”)
self.gridlayout.addwidget(self.button_add, 2, 3, 1, 1)
self.button_jian = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_jian.setobjectname(“button_jian”)
self.gridlayout.addwidget(self.button_jian, 3, 3, 1, 1)
self.button_9 = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_9.setobjectname(“button_9”)
self.gridlayout.addwidget(self.button_9, 1, 2, 1, 1)
self.button_chu = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_chu.setobjectname(“button_chu”)
self.gridlayout.addwidget(self.button_chu, 0, 2, 1, 1)
self.button_cheng = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_cheng.setobjectname(“button_cheng”)
self.gridlayout.addwidget(self.button_cheng, 0, 1, 1, 1)
self.button_8 = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_8.setobjectname(“button_8”)
self.gridlayout.addwidget(self.button_8, 1, 1, 1, 1)
self.button_4 = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_4.setobjectname(“button_4”)
self.gridlayout.addwidget(self.button_4, 2, 0, 1, 1)
self.button_esc = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_esc.setobjectname(“button_esc”)
self.gridlayout.addwidget(self.button_esc, 0, 0, 1, 1)
self.button_7 = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_7.setobjectname(“button_7”)
self.gridlayout.addwidget(self.button_7, 1, 0, 1, 1)
self.button_1 = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_1.setobjectname(“button_1”)
self.gridlayout.addwidget(self.button_1, 3, 0, 1, 1)
self.button_5 = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_5.setobjectname(“button_5”)
self.gridlayout.addwidget(self.button_5, 2, 1, 1, 1)
self.pushbutton_17 = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.pushbutton_17.settext(“”)
self.pushbutton_17.setobjectname(“pushbutton_17”)
self.gridlayout.addwidget(self.pushbutton_17, 4, 0, 1, 1)
self.button_xiaoshu = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_xiaoshu.setobjectname(“button_xiaoshu”)
self.gridlayout.addwidget(self.button_xiaoshu, 4, 1, 1, 1)
self.button_0 = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_0.setstylesheet(“”)
self.button_0.setobjectname(“button_0”)
self.gridlayout.addwidget(self.button_0, 4, 2, 1, 1)
self.button_dengyu = qtwidgets.qpushbutton(self.gridlayoutwidget)
self.button_dengyu.setobjectname(“button_dengyu”)
self.gridlayout.addwidget(self.button_dengyu, 4, 3, 1, 1)
self.retranslateui(dialog)
qtcore.qmetaobject.connectslotsbyname(dialog)
def retranslateui(self, dialog):
_translate = qtcore.qcoreapplication.translate
dialog.setwindowtitle(_translate(“dialog”, “dialog”))
self.edit_xianshi.sethtml(_translate(“dialog”, “\n”
“0
“))
self.button_6.settext(_translate(“dialog”, “6”))
self.button_2.settext(_translate(“dialog”, “2”))
self.button_3.settext(_translate(“dialog”, “3”))
self.button_fenzhi.settext(_translate(“dialog”, “1/^”))
self.button_pingfang.settext(_translate(“dialog”, “^2”))
self.button_add.settext(_translate(“dialog”, “+”))
self.button_jian.settext(_translate(“dialog”, “-“))
self.button_9.settext(_translate(“dialog”, “9”))
self.button_chu.settext(_translate(“dialog”, “/”))
self.button_cheng.settext(_translate(“dialog”, “*”))
self.button_8.settext(_translate(“dialog”, “8”))
self.button_4.settext(_translate(“dialog”, “4”))
self.button_esc.settext(_translate(“dialog”, “esc”))
self.button_7.settext(_translate(“dialog”, “7”))
self.button_1.settext(_translate(“dialog”, “1”))
self.button_5.settext(_translate(“dialog”, “5”))
self.button_xiaoshu.settext(_translate(“dialog”, “.”))
self.button_0.settext(_translate(“dialog”, “0”))
self.button_dengyu.settext(_translate(“dialog”, “=”))
if name == “main”:
import sys
app = qtwidgets.qapplication(sys.argv)
dialog = qtwidgets.qdialog()
ui = ui_dialog()
ui.setupui(dialog)
dialog.show()
sys.exit(app.exec_())
效果图：
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