我目前正在对不同的条目小部件进行多次验证，虽然所有命令都以相同的方式设置，但只有第二次条目的验证工作。有没有理由为什么其他人不这样做？这是我处理条目的代码的一部分：
import tkinter
from tkinter import *
import math
from tkinter import messagebox
class MyClass(tkinter.Frame):
def __init__(self, *args, **kwargs):
tkinter.Frame.__init__(self, *args, **kwargs)
#Setting up frame and widgets
vcmd1 = (self.register(self.__vcmd1), '%P', '%S')
vcmd2 = (self.register(self.__vcmd2), '%P')
vcmd3 = (self.register(self.__vcmd3), '%P', '%S')
self.v = IntVar()
self.v.set(1)
label_det = Label(self,text="Choose Detector")
self.mcp0 = Radiobutton(self, text="MCP-0",variable=self.v,value=1,command=self.selected)
self.mcp6 = Radiobutton(self, text="MCP-6",variable=self.v,value=2,command=self.selected)
self.mpet = Radiobutton(self,text="MCP-MPET",variable=self.v,value=3,command=self.selected)
label_det.grid(row=0, column=0, columnspan=2)
self.mcp0.grid(row=1,columnspan=2)
self.mcp6.grid(row=2,columnspan=2)
self.mpet.grid(row=3,columnspan=2)
label_iso = Label(self,text="Isotope A, Element (ex: 133,Cs)")
label_vol = Label(self, text="Beam Energy (eV)")
label_range = Label(self, text="Charge Range (ex:1,12)")
label_iso.grid(row=4, column=0, sticky=E)
label_vol.grid(row=5, column=0, sticky=E)
label_range.grid(row=6, column=0, sticky=E)
self.entry1 = tkinter.Entry(self, validate="key", validatecommand=vcmd1)
self.entry2 = tkinter.Entry(self, validate="key", validatecommand=vcmd2)
self.entry3 = tkinter.Entry(self, validate="key", validatecommand=vcmd3)
self.entry1.grid(row=4, column=1)
self.entry2.grid(row=5, column=1)
self.entry3.grid(row=6, column=1)
def __vcmd1(self, P, S):
validString = 'qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM,1234567890'
if not S in validString:
messagebox.showinfo("Error", "Not valid")
return False
if "," in P:
messagebox.showinfo("Good", "Contain comma")
if len(P.split(",")) > 2:
messagebox.showinfo("Error", "Expected Form: ex. 133,Cs")
return False
else:
return True
def __vcmd2(self, P):
if P == '':
return True
try:
float(P)
return True
except ValueError:
messagebox.showinfo("Error", "Entry must be a float or integer")
return False
def __vcmd3(self, P, S):
if "," in P:
if len(P.split(",")) > 2:
messagebox.showinfo("Error", "Contain multiple commas")
return False
a = P.split(",")[0]
b = P.split(",")[1]
if a != '' and b != '':
try:
int(a)
int(b)
except ValueError:
messagebox.showinfo("Error", "Expected form: ex. 1,12")
return False
else:
return True
def selected(self):
if self.v.get() == 1:
self.x = 8.0
elif self.v.get() == 2:
self.x = 3.0
else:
self.x = 9.2
return self.x
class TimeGenerator:
def __init__(self,master):
self.frame = MyClass(master)
self.frame.grid(columnspan=2)
self.text = Text(root)
self.iso = self.frame.entry1
self.vol = self.frame.entry2
self.r = self.frame.entry3
button = Button(root, text='Time Range', command=self.calculateTime)
button.grid(row=3, columnspan=2)
def calculateTime(self):
self.text.delete(1.0, END)
dict = {'h': 1, 'he': 2, 'li': 3, 'be': 4, 'b': 5, 'c': 6, 'n': 7, 'o': 8, 'f': 9, 'ne': 10,
'na': 11, 'mg': 12, 'al': 13, 'si': 14, 'p': 15, 's': 16, 'cl': 17, 'ar': 18,
'k': 19, 'ca': 20, 'sc': 21, 'ti': 22, 'v': 23, 'cr': 24, 'mn': 25, 'fe': 26, 'co': 27, 'ni': 28,
'cu': 29, 'zn': 30,
'ga': 31, 'ge': 31, 'as': 33, 'se': 34, 'br': 35, 'kr': 36, 'rb': 37, 'sr': 38, 'y': 39,
'zr': 40, 'nb': 41, 'mo': 42, 'tc': 43, 'ru': 44, 'rh': 45, 'pd': 46, 'ag': 47, 'cd': 48,
'in': 49, 'sn': 50, 'sb': 51, 'te': 52, 'i': 53, 'xe': 54, 'cs': 55, 'ba': 56,
'la': 57, 'ce': 58, 'pr': 59, 'nd': 60, 'pm': 61, 'sm': 62, 'eu': 63, 'gd': 64, 'tb': 65, 'dy': 66,
'ho': 67, 'er': 68, 'tm': 69, 'yb': 70, 'lu': 71,
'hf': 72, 'ta': 73, 'w': 74, 're': 75, 'os': 76, 'ir': 77, 'pt': 78, 'au': 79, 'hg': 80, 'tl': 81,
'pb': 82, 'bi': 83, 'po': 84, 'at': 85, 'rn': 86,
'fr': 87, 'ra': 88, 'ac': 89, 'th': 90, 'pa': 91, 'u': 92, 'np': 93, 'pu': 94, 'am': 95, 'cm': 96,
'bk': 97, 'cf': 98, 'es': 99, 'fm': 100, 'md': 101, 'no': 102, 'lr': 103,
'rf': 104, 'db': 105, 'sg': 106, 'bh': 107, 'hs': 108, 'mt': 109, 'ds': 110, 'rg': 111, 'cn': 112,
'uut': 113, 'fl': 114, 'uup': 115, 'lv': 116, 'uus': 117, 'uuo': 118}
if self.r.get() == "" or self.iso.get() == "" or self.vol.get() == "":
messagebox.showinfo("Error", "No field can be empty")
return None
r = self.r.get().replace(" ", "")
tup = tuple(int(x) for x in r.split(","))
iso = self.iso.get().replace(" ", "")
list = []
for e in iso.split(","):
list.append(e)
if (dict[list[1].lower()] < tup[0]) or (dict[list[1].lower()] < tup[1]):
messagebox.showinfo("Error", "Change state range does not exist for given element")
return None
f = open("/Users/LazyLinh/PycharmProjects/TimeGenGUI/mass.mas12.txt", "r")
i = 0
while (i < 40):
header = f.readline()
i += 1
self.mass = 0
#iterate through text file
for line in f:
line = line.strip()
columns = line.split()
if (list[0] == columns[3]):
if (list[1].lower() == columns[4].lower()):
if (len(columns) == 16):
self.mass = float(columns[13].replace("#","")) + float(columns[14].replace("#",""))/10e6
else:
self.mass = float(columns[12].replace("#","")) + float(columns[13].replace("#",""))/10e6
#Calculation
list = []
for q in range(tup[0], tup[1] + 1):
y = (self.frame.selected() * math.sqrt(self.mass * 1.6605402e-27 / (2 * q *1.6022e-19 * float(self.vol.get())))) * 10e6
list.append(y)
i = tup[0]
#inserting to text widget
for time in list:
self.text.insert("end", "%d: %s\n" % (i, time))
i = i + 1
self.text.grid()
self.iso = self.frame.entry1
self.vol = self.frame.entry2
self.r = self.frame.entry3
root = Tk()
b = TimeGenerator(root)
root.mainloop()
观察到的错误包括能够为条目1添加不是来自validString的字符，或者能够添加多个＆＃39;，＆＃39;进入3 ...
编辑：我已经包含了我的完整代码以及我尝试过的内容
答案 0 :(得分：1)
代码在技术上是有效的，尽管你有逻辑错误，可能会阻止它像你期望的那样工作。
要使验证功能正常工作，必须返回True或False。 任何其他有效都将禁用验证。在您的命令中，代码中的路径不会返回True或False，从而导致验证被关闭。
例如，在_vcmd 1中，如果P包含逗号，但表达式len(P.split(",")) > 2为False，则最终会返回None，这将取消任何未来的验证。
同样，在_vcmd3中，您有一条返回None的代码的路径。问问自己当你输入“4”时会发生什么。该函数返回None，再次取消将来的验证。
结论：您的功能必须始终返回True或False，否则将关闭验证。