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I am having a problem with patterns.
I have string like this:
string1 = "27.86.80.76.83.45.66.71.80.45.76.68.80.45.67.97.108.108.45.84.105.116.45.77.97.114.105.111"
The strings appear in the middle of one file, with different lengths.
For instance I am reading a file line by line and I need to know if the line has this pattern.
Can you guys point me in the right direction?
There's two different ways to go about this:
Build a parser - much work, but very flexible and possibly best performance (depending on implementation)
Use a regular expression. In your case this could be something like (\d{2,3}\.)+\d{2,3} (shortest string matched should be "111.11")
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Tetravocalic: Find all words that include four consecutive vowels.
def Tetravocalic(i):
return(re.search("/\b.*[aeiou]+.*[aeiou]+.*[aeiou]+.*[aeiou]+{4}/\b",i)))
Tetravocalic("vajjekiohkkugh")
error: multiple repeat at position 42
Please let me know the meaning of the error and the correct code as well.
ex: Tetravocalic("vajjekiohkkugh apple ororaeeg")
Your regular expression is way too complex, you only need this :'[aeiou]{4}'.
Example code:
def has_four_consecutive_vowels(s):
return bool(re.search('[aeiou]{4}', s))
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There are two major variables (calls and puts), and several sub-variables (e.g. bid, change, time etc.) For example, if there are total 5 data points. I know how to do separately:
data[u'options'][0]["calls"][0]["change"]['fmt'], data[u'options'][0]["calls"][1]["change"]['fmt'], data[u'options'][0]["calls"][2]["change"]['fmt'], data[u'options'][0]["calls"][3]["change"]['fmt'],data[u'options'][0]["calls"][4]["change"]['fmt']
but that spend too much time. I wonder how to choose multiple items in one code.
You can do this with a little bit of list comprehension if I understand your question properly.
For each value in data["options"][0]["calls"], it adds that value's ["change"]["fmt"] value to the list.
d = [call["change"]["fmt"] for call in data["options"][0]["calls"]]
If you want a list of EACH value from every set of options, you could do it like so:
d = [[call["change"]["fmt"] for call in option["calls"]] for option in data["options"]]
and now you can say
for option in d:
for call in option:
print(call)
[data[u'options'][0]["calls"][i]["change"]['fmt'] for i in range(5)]
I don't quite understand your problem, is this what you're after?
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I want to get < from a string that contains the character.
So what I want to do is:
magic_function('<') = <
in order to make. For example:
1 magic_function('<') 3
I expect, of course, that the program returns True
This isn’t possible with specifically what you want. A function returns an object, not an operator. I’m not sure what your main intention is here but you might want to rethink your architecture.
What you can do (but what I don’t recommend) is using eval() like so:
eval(“1 < 3”)
But there are many resources online about why eval is “evil”: to sum them up, if you don’t know what your data source is, then you could be performing unexpected operations which you might not want.
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I have following python code:
import re
result = re.match('a.*b', 'aabab')
result.groups() # result is ()
len(result.groups()) # it's 0
result.group(0) # result is 'aabab'
I only know some basic regex, but I can not understand the groups and group. Could someone give some basic explanation about this.
and more, please give some explanation about Pattern and Matcher in python if possible.
Groups are used to capture specific parts of a regular expression. Your regex does not define any groups, therefore the group count is zero.
group(0) is a special case, and it contains the entire match.
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How to get all methods/functions available that contain a particular string? For ex., use *csv* to get all the method/function details which have the csv text in them.
The above is for the sake of learning, each class supports a lot of methods. I would like to filter and narrow down the list of methods, so that I can explore them. Same is the case with functions also, for the sake of learning.
You can examine the globals() dictionary:
[x for x,y in globals().items() if 'csv' in x and callable(y)]
If you only wanna functions, you can do something like this:
[x for x,y in globals().iteritems() if 'csv' in x and y.__class__.__name__ == 'function']
but if you want also classes I recommend you to use Rob's way.