Cannot runcell if double backslash is present

[jnsebgosselin]

Issue Report Checklist

• Searched the issues page for similar reports
• Completed the Problem Description, Steps to Reproduce and Version sections below

Problem Description

@bcolsen

I think this was introduced in PR #7310. I was not able to reproduce the error when checking out to 29e0623.

What steps reproduce the problem?

1. Create a new file with the following content in the Editor :

# -*- coding: utf-8 -*-
#%%

dirname = ("C:\\Users\\User\\test.py")

# %%

2. Run the cell (Ctrl + Enter or Shift + Enter).

What is the expected output? What do you see instead?

dirname should be defined in the current console, but an error is raised instead.

Paste Traceback/Error Below (if applicable)

runcell('','C:/Users/User/Desktop/test.py')
  File "<ipython-input-26-0a3ec57e3b80>", line 4
    dirname = ("C:\Users\User\test.py")
              ^
SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape

Versions

• Spyder version: Spyder 4.0.0.dev0 4479343
• Python version: Python 3.6.6 64-bit
• Qt version: Qt 5.6.2
• PyQt version: PyQt5 5.6
• Operating System name/version: Windows 10

Dependencies

pygments >=2.0    :  2.2.0 (OK)
sphinx >=0.6.6    :  1.8.1 (OK)
pyls >=0.19.0     :  0.19.0 (OK)
nbconvert >=4.0   :  5.3.1 (OK)
pandas >=0.13.1   :  0.23.4 (OK)
numpy >=1.7       :  1.15.2 (OK)
sympy >=0.7.3     :  None (NOK)
cython >=0.21     :  None (NOK)
qtconsole >=4.2.0 :  4.5.0.dev0 (OK)
IPython >=4.0     :  7.0.1 (OK)
matplotlib >=2.0.0:  None (NOK)
pylint >=0.25     :  2.1.1 (OK)

[ccordoba12]

@bcolsen, could you take a look at this one? Thanks!

[bcolsen]

It looks like the escape /'s are being remove before running the cell.

I get the same error running:

In [112]: dirname = ('C:\Users\User\test.py')
  File "<ipython-input-112-09e9a480868a>", line 1
    dirname = ('C:\Users\User\test.py')
              ^
SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape

I can test this tonight but I think a 'r"""{}"""') on this line might work:

spyder/spyder/plugins/ipythonconsole/plugin.py

Line 939 in 4733c44

'"""{}"""')

[ccordoba12]

Yep, I was thinking an r would help to solve this.

[jnsebgosselin]

Cool, thank you very much for taking care of this! This is a little bit annoying hehe

[bcolsen]

I actually ran into this one myself this afternoon with a \n :-)