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What is the most efficient way to create a dictionary of two pandas Dataframe columns?
...Speed comparion (using Wouter's method)
In [6]: df = pd.DataFrame(randint(0,10,10000).reshape(5000,2),columns=list('AB'))
In [7]: %timeit dict(zip(df.A,df.B))
1000 loops, best of 3: 1.27 ms per loop
In [8]: %timeit pd.Series(df.A.values,index=df.B).to_dict()
1000 loops, best of 3: 987 us per loop...
Python 3: UnboundLocalError: local variable referenced before assignment [duplicate]
... rather than relying on Globals
def function(Var1, Var2):
if Var2 == 0 and Var1 > 0:
print("Result One")
elif Var2 == 1 and Var1 > 0:
print("Result Two")
elif Var1 < 1:
print("Result Three")
return Var1 - 1
function(1, 1)
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Generate list of all possible permutations of a string
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70
There are several ways to do this. Common methods use recursion, memoization, or dynamic program...
TypeError: sequence item 0: expected string, int found
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edited Jun 4 '12 at 12:00
answered Jun 4 '12 at 11:54
cv...
Force drop mysql bypassing foreign key constraint
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answered Feb 19 '10 at 23:53
Otávio DécioOtávio Décio
68.9k1414 gold badges152152 silver badges219219 bronze badges
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Python dict how to create key or append an element to key?
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edited Sep 30 '14 at 22:31
answered Oct 16 '12 at 0:43
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Get a filtered list of files in a directory
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400
import glob
jpgFilenamesList = glob.glob('145592*.jpg')
See glob in python documenttion
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How to determine function name from inside a function
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You can use ${FUNCNAME[0]} in bash to get the function name.
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How to replace all strings to numbers contained in each string in Notepad++?
... say that you want to match each of the following lines
value="4"
value="403"
value="200"
value="201"
value="116"
value="15"
using the .*"\d+" pattern and want to keep only the number. You can then use a capture group in your matching pattern, using parentheses ( and ), like that: .*"(\d+)". So n...
Is calculating an MD5 hash less CPU intensive than SHA family functions?
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Yes, MD5 is somewhat less CPU-intensive. On my Intel x86 (Core2 Quad Q6600, 2.4 GHz, using one core), I get this in 32-bit mode:
MD5 411
SHA-1 218
SHA-256 118
SHA-512 46
and this in 64-bit mode:
MD5 407
SHA-1 312
SHA-256 148
SHA-512 189
Figures are in megabytes ...