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How to determine an interface{} value's “real” type?
...the type in next time.
var data map[string]interface {}
...
for k, v := range data {
fmt.Printf("pair:%s\t%s\n", k, v)
switch t := v.(type) {
case int:
fmt.Printf("Integer: %v\n", t)
case float64:
fmt.Printf("Float64: %v\n", t)
case string:
fmt.Prin...
Remove all the elements that occur in one list from another
...x in l1 if x not in l2set]
benchmark test code:
import time
l1 = list(range(1000*10 * 3))
l2 = list(range(1000*10 * 2))
l2set = {x for x in l2}
tic = time.time()
l3 = [x for x in l1 if x not in l2set]
toc = time.time()
diffset = toc-tic
print(diffset)
tic = time.time()
l3 = [x for x in l1 if...
Execution of Python code with -m option or not
...mandline option doc example)
$ python -m timeit '"-".join(str(n) for n in range(100))'
10000 loops, best of 3: 40.3 usec per loop
$ python -m timeit '"-".join([str(n) for n in range(100)])'
10000 loops, best of 3: 33.4 usec per loop
$ python -m timeit '"-".join(map(str, range(100)))'
10000 loops, b...
How to crop an image in OpenCV using Python
...nly 100x100 region from the upper left corner.
Slicing:
X = []
for i in range(N):
im = imread('image_i')
X.append(im[0:100,0:100]) # This will keep all N images in the memory.
# Because they are still used.
Alternatively, you can copy the relevant part by ...
How to link to specific line number on github
...number, and then copy and paste the link from the address bar. To select a range, click the number, and then shift click the later number.
Alternatively, the links are a relatively simple format, just append #L<number> to the end for that specific line number, using the link to the file. Here...
What are invalid characters in XML
.... */
Basically, the control characters and characters out of the Unicode ranges are not allowed.
This means also that calling for example the character entity &#x3; is forbidden.
1.2. In XML 1.1
Reference: see XML recommendation 1.1, §2.2 Characters, and 1.3 Rationale and list of changes f...
Indent multiple lines quickly in vi
...om line
Ex commands
These are useful when you want to indent a specific range of lines, without moving your
cursor.
:< and :> Given a range, apply indentation e.g.
:4,8> indent lines 4 to 8, inclusive
Indenting using markers
Another approach is via markers:
ma Mark top of bloc...
How to get the caller's method name in the called method?
...file and file[0] + file[-1] != '<>': IndexError: string index out of range Can u please provide suggestion. Thanx in advance.
– Pooja
Aug 13 '14 at 11:07
...
How to implement __iter__(self) for a container object (Python)
... next(rev) # note no need to call iter()
'm'
>>> nums = Reverse(range(1,10))
>>> next(nums)
9
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Apply pandas function to column to create multiple new columns?
...I usually do this using zip:
>>> df = pd.DataFrame([[i] for i in range(10)], columns=['num'])
>>> df
num
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
>>> def powers(x):
>>> return x, x**2, x**3, x**4, x**5, x**6
>>> df[...