Hi,
I have a dictionary, a string, and I'm creating another string, like
this:
dict = {}
dict[beatles] = "need"
str = "love"
mystr = """All you %(dict[beatles])s is %(str)s""" % locals()
Why do I get
keyerror: 'dict[one]'?
Is there a way to reference the elements in a dictionary with locals()
or do I need to create a temp variable, like
need = dict[one]
mystr = """All you %(need)s is %(str)s""" 4 1202
JerryB wrote: Hi, I have a dictionary, a string, and I'm creating another string, like this:
dict = {} dict[beatles] = "need" str = "love"
mystr = """All you %(dict[beatles])s is %(str)s""" % locals()
Why do I get keyerror: 'dict[one]'?
Is there a way to reference the elements in a dictionary with locals() or do I need to create a temp variable, like
need = dict[one] mystr = """All you %(need)s is %(str)s"""
1) Avoid variable names like 'dict' and 'str'- they cover up the builtin
names.
2) When showing error, don't retype - cut and paste: dict[beatles] = "need"
Traceback (most recent call last):
File "<pyshell#6 >", line 1, in -toplevel-
dict[beatles] = "need"
NameError: name 'beatles' is not defined dict['beatles'] = "need"
3) In string formating, the item in parenthesis, used as a string, is
the key for the dictionary. That is:
"""All you %(dict[beatles])s is %(str)s""" % ld
is the same as
"""All you %s is %s""" % (ld['dict[beatles]'],ld['str'])
4) Your best bet is not to use locals(), but to create a new dictionary
with the appropriate keys. E.g.:
d = {} d['beatles'] = "need" s = "love" d2 = d.copy() d2['str'] = s d['str']
Traceback (most recent call last):
File "<pyshell#2 4>", line 1, in -toplevel-
d['str']
KeyError: 'str' d2['str']
'love' mystr = """All you %(beatles)s is %(str)s""" % d2 print mystr
All you need is love
Rocco:
thanks for your response. The examples were just made up. I don't
normally use 'dict' and 'str'.
I know I can create a dictionary with the variables I want, etc. My
question is not how to solve the problem, or how to come up with a
work-around (I'm getting pretty good at this one :), so my question
stands:
is it possible to access the individual members of a dictionary using %
locals() when creating a string?
Thank you again for your suggestions.
Jerry
JerryB <gr******@gmail .com> wrote:
... is it possible to access the individual members of a dictionary using % locals() when creating a string?
Not by using the built-in locals(); you'd have to override locals to
mean someting different (not recommended).
Alex
JerryB wrote: Rocco: thanks for your response. The examples were just made up. I don't normally use 'dict' and 'str'. I know I can create a dictionary with the variables I want, etc. My question is not how to solve the problem, or how to come up with a work-around (I'm getting pretty good at this one :), so my question stands:
is it possible to access the individual members of a dictionary using % locals() when creating a string?
You might want to use a more powerful templating engine, for example http://cheetahtemplate.org/ and probably many others.
Kent This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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