大约有 5,400 项符合查询结果（耗时：0.0389秒） [XML]
Converting a column within pandas dataframe from int to string
...0 1
1 2 3
2 4 5
3 6 7
4 8 9
In [18]: df.dtypes
Out[18]:
A int64
B int64
dtype: object
Convert a series
In [19]: df['A'].apply(str)
Out[19]:
0 0
1 2
2 4
3 6
4 8
Name: A, dtype: object
In [20]: df['A'].apply(str)[0]
Out[20]: '0'
Don't forget to assign the resul...
What is the smallest possible valid PDF?
... 69 6C 65 72 3C
3C 2F 52 6F 6F 74 3C 3C 2F 50 61 67 65 73 3C 3C
2F 4B 69 64 73 5B 3C 3C 2F 4D 65 64 69 61 42 6F
78 5B 30 20 30 20 33 20 33 5D 3E 3E 5D 3E 3E 3E
3E 3E 3E
I tried taking off the last end dictionary (>>), but Acrobat wouldn't have that. The PDF reading built-in to Google C...
What is time_t ultimately a typedef to?
...t systems implement the time_t type as a signed
integer (typically 32 or 64 bits wide)
which represents the number of seconds
since the start of the Unix epoch:
midnight UTC of January 1, 1970 (not
counting leap seconds). Some systems
correctly handle negative time values,
while others...
Need a good hex editor for Linux [closed]
...is no good hex editor for Linux system, specially for big files.
It uses 64 bit file descriptors (supports files or devices up to 2^64 bytes , means some exabytes but tested only 1 PetaByte file (yet). ).
It does NOT copy whole file to your RAM. That make it FAST and can open files (which sizes ar...
How to set JAVA_HOME in Linux for all users
... /etc/profile.d/jdk_home.sh:
#!/bin/sh
export JAVA_HOME=/opt/ibm/java-x86_64-60/
export PATH=$JAVA_HOME/bin:$PATH
I initially neglected the first line (the #!/bin/sh), and it won't work without it.
Now it's working:
$ echo $JAVA_HOME
/opt/ibm/java-x86_64-60/
...
Quit and restart a clean R session from within R?
...eActiveBinding("restart.R", function() { shell.exec(paste0(R.home(),"/bin/x64/Rgui.exe")); q("no") }, .GlobalEnv)
You'll need to edit the file path /bin/x64/Rgui.exe to match whatever you use to start R. You just put this line in your .Rprofile file, then you can call it by entering restart.R in y...
XMLHttpRequest Origin null is not allowed Access-Control-Allow-Origin for file:/// to file:/// (Serv
... use with https://github.com/kripken/sql.js/)
I created a file called base64_data.js (and used btoa() to convert the data that I needed and insert it into a <div> so I could copy it).
var base64_data = "U1FMaXRlIGZvcm1hdCAzAAQA ...<snip lots of data> AhEHwA==";
and then included the ...
The builds tools for v120 (Platform Toolset = 'v120') cannot be found
Using visual studio 2012 on windows 8 x64
aparantly this is caused by msbuild being moved into .net but I havn't seen how to fix it yet.
...
Why isn't sizeof for a struct equal to the sum of sizeof of each member?
...'s an example using typical settings for an x86 processor (all used 32 and 64 bit modes):
struct X
{
short s; /* 2 bytes */
/* 2 padding bytes */
int i; /* 4 bytes */
char c; /* 1 byte */
/* 3 padding bytes */
};
struct Y
{
int i; /* 4 bytes */
ch...
Extracting just Month and Year separately from Pandas Datetime column
...
Note that the resulting column is not of the datetime64 dtype anymore. Using df.my_date_column.astype('datetime64[M]'), as in @Juan's answer converts to dates representing the first day of each month.
– Nickolay
May 26 '18 at 19:52
...