我试图将字符串转换为SymPy表达式。我已经尝试了Option Explicit
Sub InsertShapeRxC()
Dim strInput As String
Dim lngRows As Long, lngColumns As Long
Dim rngShape As Range
Dim ws As Worksheet
Dim shp As Shape
' get user input as string
strInput = Application.InputBox("Please enter RxC", Type:=2)
' get rows and columns from input - expected RxC
lngRows = Split(strInput, "x", -1, vbTextCompare)(0)
lngColumns = Split(strInput, "x", -1, vbTextCompare)(1)
' resize current selection to rows and columns as input
Set rngShape = Selection
Set rngShape = rngShape.Resize(lngRows, lngColumns)
' get reference to worksheet
Set ws = rngShape.Parent
' add shape
Set shp = ws.Shapes.AddShape(1, rngShape.Left, rngShape.Top, rngShape.Width, rngShape.Height)
With shp
.Fill.Visible = msoFalse
With .Line
.Visible = msoTrue
.ForeColor.RGB = RGB(0, 0, 0)
.Transparency = 0
End With
End With
With rngShape
.Borders(xlInsideHorizontal).LineStyle = xlContinuous
.Borders(xlInsideVertical).LineStyle = xlContinuous
End With
End Sub
Sub InsertShapeWithRange()
Dim strInput As String
Dim lngRows As Long, lngColumns As Long
Dim rngShape As Range
Dim ws As Worksheet
Dim shp As Shape
' get user input as string
Set rngShape = Application.InputBox("Please enter range", Type:=8)
' get reference to worksheet
Set ws = rngShape.Parent
' add shape
Set shp = ws.Shapes.AddShape(1, rngShape.Left, rngShape.Top, rngShape.Width, rngShape.Height)
With shp
.Fill.Visible = msoFalse
With .Line
.Visible = msoTrue
.ForeColor.RGB = RGB(0, 0, 0)
.Transparency = 0
End With
End With
With rngShape
.Borders(xlInsideHorizontal).LineStyle = xlContinuous
.Borders(xlInsideVertical).LineStyle = xlContinuous
End With
End Sub
和sympify()，但两者都返回了错误。如何使用替代方法更正这些错误或解决这些错误？我使用的是Python 3.4。
parse_expr()这两个函数都会返回以下错误：
from sympy import *
s = 'C+O*2'
expr = sympify(s)
from sympy.parsing.sympy_parser import parse_expr
s = 'C+O*2'
expr = parse_expr(s)
答案 0 :(得分：1)
正如同情的documentation解释：
[T]他
O被解释为Order对象（与系列一起使用），如果使用不当会引发错误[。]
它提出了一些解决方法，我更喜欢的是使用碰撞本地：
>>> from sympy.abc import _clash1
>>> sympify("C+O*2", locals=_clash1)
C + 2*O