本文主要介紹了QLineEdit正則表達(dá)式輸入驗證器，分享給大家，具體如下：
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from PyQt5 import QtWidgets, QtCore, QtGui, Qtimport re############## QLineEdit正則表達(dá)式輸入驗證器class LineEditRegExpValidator(QtGui.QValidator): ''' # 默認(rèn)為科學(xué)計數(shù)法輸入驗證器 用法 SciNotValidator = LineEditRegExpValidator() # 創(chuàng)建一個QLineEdit正則表達(dá)式輸入驗證器的類，默認(rèn)為科學(xué)計數(shù)法輸入驗證器 self.LineEdit1.setValidator(SciNotValidator) # 設(shè)置驗證器（啟用） self.LineEdit1.installEventFilter(SciNotValidator) # QLineEdit清空內(nèi)容且游標(biāo)失焦時，自動填充上一次的字符串內(nèi)容 self.LineEdit2.setValidator(SciNotValidator) self.LineEdit2.installEventFilter(SciNotValidator) self.LineEdit3.setValidator(SciNotValidator) self.LineEdit3.installEventFilter(SciNotValidator) Validator.validate() is abstract and must be overriddenValidator.validate() is abstract and must be overridden ''' def __init__( self, # 編輯狀態(tài)框輸入結(jié)束允許的字符串 fullPatterns=[ r"[+|-]?[0-9]+\.?[0-9]*(?:[Ee][+|-]?[0-9]+)?", r'[+|-]{0,1}nan', r'[+|-]{0,1}inf' ], # 編輯狀態(tài)框輸入尚未結(jié)束允許的字符串 partialPatterns=[ r'[+|-]?[0-9]+\.?[0-9]*(?:[Ee][+|-]?)?', r'-', r'\+', r'[+|-]{0,1}nan', r'[+|-]{0,1}na', r'[+|-]{0,1}n', r'[+|-]{0,1}inf', r'[+|-]{0,1}in', r'[+|-]{0,1}i' ], fixupString='1.0' ): super(LineEditRegExpValidator, self).__init__() self.fullPatterns = fullPatterns self.partialPatterns = partialPatterns self.fixupString = fixupString # 實時監(jiān)聽文本框的改變 # 可能是鍵盤單個字符'n'輸入, 也有可能是粘貼多個字符'nan'輸入 def validate(self, string, pos) -> QtGui.QValidator.State: # string為編輯狀態(tài)框中可見的字符串+輸入字符/字符串 # 編輯過程結(jié)束，若返回True，將編輯狀態(tài)框中的字符串填入LineEdit,若返回Flase則自動調(diào)用self.fixup方法，將fixup方法返回的字符串填入LineEdit if self.acceptable_check(string): #print(f'QtGui.QValidator.Acceptable:{QtGui.QValidator.Acceptable}') return QtGui.QValidator.Acceptable, string, pos # QtGui.QValidator.Acceptable = 2; # 編輯過程中允許出現(xiàn)的字符串 if self.intermediate_check(string): #print(f'QtGui.QValidator.Intermediate:{QtGui.QValidator.Intermediate}') return QtGui.QValidator.Intermediate, string, pos # QtGui.QValidator.State = 1; # 編輯過程中不允許出現(xiàn)的字符串(本次輸入的單個字符或字符串無效) else: #print(f'QtGui.QValidator.Invalid:{QtGui.QValidator.Invalid}') return QtGui.QValidator.Invalid, string, pos # 編輯狀態(tài)框驗證通過, 編輯狀態(tài)框單個字輸入符成功 def acceptable_check(self, string) -> bool: True_ = 0 for fullPattern in self.fullPatterns: if re.fullmatch(fullPattern, string): True_ += 1 else: continue if True_ != 0: return True else: return False # 輸入還未結(jié)束允許的字符串 def intermediate_check(self, string): #-> bool; string為編輯狀態(tài)框中可見的字符串 """ Checks if string makes a valid partial float, keeping in mind locale dependent decimal separators. """ if string == '': return True for partialPattern in self.partialPatterns: if re.fullmatch(partialPattern, string): return True else: pass # def eventFilter(self, lineEdit, event): # -> bool # FocusIn event # 每當(dāng)fous in時，更新LineEditRegExpValidator的fixupString # 輸入驗證器 ''' SciNotValidator = LineEditRegExpValidator() self.LineEdit1.setValidator(SciNotValidator) self.LineEdit1.installEventFilter(SciNotValidator) ''' if event.type() == QtCore.QEvent.FocusIn: # do custom stuff # print('focus in') # self.lineEdit_zhuansu.installEventFilter(SciNotValidator)， 在本類中，widget是self.lineEdit，執(zhí)行函數(shù)self.lineEdit.text(), 其它類不一定有text()方法 #lineEdit.selectAll() QtCore.QTimer.singleShot(0, lineEdit.selectAll) # 0ms self.fixupString = lineEdit.text() #print(self.fixupString) # return False so that the lineEdit will also handle the event # otherwise it won't focus out return False else: # we don't care about other events return False # 重寫QValidator的fixup(str)方法。可以在切換焦點后，直接修改不合規(guī)則的字符串。參數(shù)str是經(jīng)過validate()方法驗證后的字符串； def fixup(self, string) -> str: """ Fixes up input text to create a valid float. Puts an empty string on failure. """ print(string) True_ = 0 for fullPattern in self.fullPatterns: if re.fullmatch(fullPattern, string): True_ += 1 else: continue if True_ != 0: return string else: return self.fixupString# listWidget、tableWidget輸入數(shù)據(jù)檢查class LineEditDelegate_Regx(QtWidgets.QStyledItemDelegate): # 科學(xué)計數(shù)法正則表達(dá)式 regx = r"-?\ *[0-9]+\.?[0-9]*(?:[Ee]\ *-?\ *[0-9]+)?" # """ -? optionally matches a negative sign (zero or one negative signs) \ * matches any number of spaces (to allow for formatting variations like - 2.3 or -2.3) [0-9]+ matches one or more digits \.? optionally matches a period (zero or one periods) [0-9]* matches any number of digits, including zero (?: ... ) groups an expression, but without forming a "capturing group" (look it up) [Ee] matches either "e" or "E" \ * matches any number of spaces (to allow for formats like 2.3E5 or 2.3E 5) -? optionally matches a negative sign \ * matches any number of spaces [0-9]+ matches one or more digits ? makes the entire non-capturing group optional (to allow for the presence or absence of the exponent - 3000 or 3E3 https://stackoverflow.com/questions/18152597/extract-scientific-number-from-string """ """ 用法： def __init__(self, parent=None): super(NewClassName, self).__init__(parent) self.setupUi(self) delegate = LineEditDelegate_Regx(regx=None) self.listWidget_ShuZhiLieBiao.setItemDelegate(delegate) self.tableWidget.setItemDelegate(delegate) """ def __init__(self, regx=None, parent=None): super(LineEditDelegate_Regx, self).__init__(parent) if regx == None: pass else: self.regx = regx # 方法重寫 def createEditor(self, parent, option, index): # self, parent, option, index四個參數(shù)均不能少 editor_qlineedit = QtWidgets.QLineEdit(parent) #SciNotValidator = QtGui.QRegExpValidator(QtCore.QRegExp(self.regx)) SciNotValidator = LineEditRegExpValidator() editor_qlineedit.setValidator(SciNotValidator) return editor_qlineedit # LineEditDelegate_Regx(regx=None, parent=None), QStyledItemDelegate(parent: QObject = None)"""# LineEdit輸入數(shù)據(jù)檢查def LineEditInputChecking(lineEdit, regx=None): ''' 用法： LineEditInputChecking(lineEdit=self.lineEdit_zhuansu) ''' if regx == None: regx = r"-?\ *[0-9]+\.?[0-9]*(?:[Ee]\ *-?\ *[0-9]+)?" reg_ex = QtCore.QRegExp(regx) input_validator = QtGui.QRegExpValidator(reg_ex, lineEdit) lineEdit.setValidator(input_validator)""" |
參考：
https://stackoverflow.com/questions/39202697/qt-qlineedit-input-validation
https://stackoverflow.com/questions/15829782/how-to-restrict-user-input-in-qlineedit-in-pyqt
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原文鏈接：https://blog.csdn.net/caviar126/article/details/114959867
