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pandas read_csv and filter columns with usecols
I have a csv file which isn't coming in correctly with pandas.read_csv when I filter the columns with usecols and use multiple indexes.
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How do cache lines work?
...gs in about 64 bytes at a time, whatever the size of the actual data being read.
5 Answers
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Is it safe to get values from a java.util.HashMap from multiple threads (no modification)?
...d again. It will however, be accessed (via get(key) only) from multiple threads. Is it safe to use a java.util.HashMap in this way?
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How to read an entire file to a string using C#?
What is the quickest way to read a text file into a string variable?
16 Answers
16
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How to compare 2 files fast using .NET?
Typical approaches recommend reading the binary via FileStream and comparing it byte-by-byte.
18 Answers
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Generating an MD5 checksum of a file
...on't be able to fit the whole file in memory. In that case, you'll have to read chunks of 4096 bytes sequentially and feed them to the md5 method:
import hashlib
def md5(fname):
hash_md5 = hashlib.md5()
with open(fname, "rb") as f:
for chunk in iter(lambda: f.read(4096), b""):
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bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...统计。
在bpftrace结束(如按Ctrl-C)时Maps自动打印出来
5. read()分布统计
# bpftrace -e 'tracepoint:syscalls:sys_exit_read /pid == 18644/ { @bytes = hist(args->ret); }'
Attaching 1 probe...
^C
@bytes:
[0, 1] 12 |@@@@@@@@@@@@@@@@@@@@ ...
how to read System environment variable in Spring applicationContext
How to read the system environment variable in the application context?
11 Answers
11
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What is the perfect counterpart in Python for “while not EOF”
To read some text file, in C or Pascal, I always use the following snippets to read the data until EOF:
7 Answers
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How do I execute a command and get the output of the command within C++ using POSIX?
...;iostream>
int main()
{
// run a process and create a streambuf that reads its stdout and stderr
redi::ipstream proc("./some_command", redi::pstreams::pstdout | redi::pstreams::pstderr);
std::string line;
// read child's stdout
while (std::getline(proc.out(), line))
std::cout <&...