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Read only the first line of a file?
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Use the .readline() method (Python 2 docs, Python 3 docs):
with open('myfile.txt') as f:
first_line = f.readline()
Some notes:
As noted in the docs, unless it is the only line in the file, the string returned from f.readline() will contain a trailing ...
How to get a value from a cell of a dataframe?
...value using the column name:
In [3]: sub_df
Out[3]:
A B
2 -0.133653 -0.030854
In [4]: sub_df.iloc[0]
Out[4]:
A -0.133653
B -0.030854
Name: 2, dtype: float64
In [5]: sub_df.iloc[0]['A']
Out[5]: -0.13365288513107493
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How to get href value using jQuery?
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answered Jan 20 '10 at 1:38
GarethGareth
109k3030 gold badges141141 silver badges151151 bronze badges
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What does [ N … M ] mean in C aggregate initializers?
From sys.c line 123:
1 Answer
1
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where is gacutil.exe?
I am using Windows 7 Enterprise 32 bit. I have used Windows command line, and also used VSTS 2008 command line, but when executing gacutil.exe, there is command not found error.
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How to calculate a time difference in C++
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123
See std::clock() function.
const clock_t begin_time = clock();
// do something
std::cout <&...
How can I create Min stl priority_queue?
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2
@AraK, I think you mean operator< ;)
– Peter Alexander
Mar 13 '10 at 17:46
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Dynamically generating a QR code with PHP [closed]
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https://chart.googleapis.com/chart?chs=300x300&cht=qr&chl=http%3A%2F%2Fwww.google.com%2F&choe=UTF-8
300x300 is the size of the QR image you want to generate,
the chl is the url-encoded string you want to change into a QR code, and
the choe is the (optional) encoding.
The link, abov...
When do we need curly braces around shell variables?
... unconditionally required when:
expanding array elements, as in ${array[42]}
using parameter expansion operations, as in ${filename%.*} (remove extension)
expanding positional parameters beyond 9: "$8 $9 ${10} ${11}"
Doing this everywhere, instead of just in potentially ambiguous cases, can be c...
How to increase heap size of an android application?
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211
You can use android:largeHeap="true" to request a larger heap size, but this will not work on ...