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How to limit the maximum value of a numeric field in a Django model?
...is there any way to restrict it to storing only numbers within a certain range, e.g. 0.0-5.0 ?
6 Answers
...
Print a list in reverse order with range()?
How can you produce the following list with range() in Python?
19 Answers
19
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Read Excel File in Python
...ber_of_columns = sheet.ncols
items = []
rows = []
for row in range(1, number_of_rows):
values = []
for col in range(number_of_columns):
value = (sheet.cell(row,col).value)
try:
value = str(int(value))
except ValueErro...
Difference between Python's Generators and Iterators
....
For example, a generator such as:
def squares(start, stop):
for i in range(start, stop):
yield i * i
generator = squares(a, b)
or the equivalent generator expression (genexp)
generator = (i*i for i in range(a, b))
would take more code to build as a custom iterator:
class Squares(obj...
C default arguments
...y you can solve the defaults problem and allow for an empty call. #define vrange(...) CALL(range,(param){.from=1, .to=100, .step=1, __VA_ARGS__})
– u0b34a0f6ae
Oct 29 '11 at 4:58
3...
UILabel with text of two different colors
...undColorAttributeName
value:[UIColor redColor]
range:NSMakeRange(10, 1)];
[label setAttributedText: text];
I created a UILabel extension to do it.
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C++使用OLE/COM高速读写EXCEL的源码 - C/C++ - 清泛网 - 专注C/C++及内核技术
...注几个_Application、Workbooks、_Workbook、Worksheets、_Worksheet、Range等几个接口。Excel的各类接口的属性、方法可以通过MSDN的Office Development进行查询。
VS2010导入OLE/COM组件的接口的步骤为：Project->Class Wizard->Add Class->MFC Class From TypeLib，先...
Regex to Match Symbols: !$%^&*()_+|~-=`{}[]:";'?,./
...acters.
Edit:
The hyphen is special because it can be used to represent a range of characters. This same character class can be simplified with ranges to this:
/[$-/:-?{-~!"^_`\[\]]/
There are three ranges. '$' to '/', ':' to '?', and '{' to '~'. the last string of characters can't be represe...
Random string generation with upper case letters and digits
...e:
''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(N))
or even shorter starting with Python 3.6 using random.choices():
''.join(random.choices(string.ascii_uppercase + string.digits, k=N))
A cryptographically more secure version; see https://stackoverflow.com/a/237...
How to loop backwards in python? [duplicate]
...
range() and xrange() take a third parameter that specifies a step. So you can do the following.
range(10, 0, -1)
Which gives
[10, 9, 8, 7, 6, 5, 4, 3, 2, 1]
But for iteration, you should really be using xrange instead....