d5b9ee74-a580-412c-b8f5-619ccd976881
commented
7 years ago Take this format python code:
import unicodedata
c = chr(0x012345)To print that character as a string literal, you would expect to do:
print(f"'\\N{{{unicodedata.name(c)}}}'")Which should print a literal quote ('), a backwards slash (\\ -> \), an N, and the two {{ should escape and print {, followed by the f-expression unicodedata.name(c), then the }} would print one }, and then another literal quote (').
However, this raises a SyntaxError: f-string: single '}' is not allowed. The way to do this without a syntax error is like so:
print(f"'\\N{{unicodedata.name(c)}}}'")Which prints the expected:
'\N{CUNEIFORM SIGN URU TIMES KI}'The shortest way to reproduce this is:
f'\\N{'Which works, and:
f'\\N{{'which raises an error, even though the first one should raise an error (SyntaxError: f-string: expecting '}').
ned-deily
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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GitHub fields: ```python assignee = None closed_at =
created_at =
labels = ['3.7']
title = '\\\\N in f-string causes next { to be literal if not escaped'
updated_at =
user = 'https://github.com/MitalAshok'
```
bugs.python.org fields:
```python
activity =
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date =
closer = 'ned.deily'
components = []
creation =
creator = 'Mital Ashok'
dependencies = []
files = []
hgrepos = []
issue_num = 30955
keywords = []
message_count = 2.0
messages = ['298563', '298564']
nosy_count = 2.0
nosy_names = ['ned.deily', 'Mital Ashok']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue30955'
versions = ['Python 3.6', 'Python 3.7']
```