sys | 易学教程

Run python script with some of the argument that are optional

阅读更多关于 Run python script with some of the argument that are optional

问题 I have gone through the sys documentation, however there is something that is still unclear to me. I have looked for some similar question on stackoverflow, but I haven't find anything useful (clearly any reference is appreciated!). I want to create a script - say foo.py - in which I want pass from 3 to 6 arguments: $ python foo.py arg1 arg2 arg3 The first 3 arguments must be given in any case; the last 3 arguments are used in a function that have default argument values if nothing is passed.

Oracle Sys和system用户区别

阅读更多关于 Oracle Sys和system用户区别

区别之一：存储的数据的重要性不同 sys 用户所有oracle的数据字典的基表和视图都存放在sys用户中，这些基表和视图对于oracle的运行是至关重要的，由数据库自己维护，任何用户都不能手动更改。sys用户拥有dba，sysdba，sysoper等角色或权限，是oracle权限最高的用户。 systeM 用户用于存放次一级的内部数据，如oracle的一些特性或工具的管理信息。system用户拥有普通dba角色权限。区别之二：权限的不同。 sys 用户具有“SYSDBA”或者“SYSOPER”系统权限，登陆em也只能用这两个身份，不能用normal。 system 用户只能用normal身份登陆em，除非你对它授予了sysdba的系统权限或者syspoer系统权限。示例: 　以sys用户登陆Oracle，执行select * from V_$PWFILE_USERS;可查询到具有sysdba权限的用户，如： SQL> select * from v$pwfile_users; USERNAME SYSDBA SYSOPER ------------------------------ ------ ------- SYS TRUE TRUE SYSTEM TRUE FALSE 来源： oschina 链接： https://my.oschina.net/u/2971691

Jupyter notebook, wrong sys.path and sys.executable

阅读更多关于 Jupyter notebook, wrong sys.path and sys.executable

问题 I'm trying to run the anaconda distribution of python libraries in a Jupyter Notebook, but when I run the notebook I keep getting ImportErrors because the python path is set to the default distribution from Mac OS X 10.11 When I print out the sys.path and sys.executable, they differ when running python vs running jupyter notebook. For example, from pprint import pprint as p import sys p(sys.path) After doing this in python I get the correct output: ['', '/Users/glennraskovich/anaconda2/lib

IPython sys.path different from python sys.path

阅读更多关于 IPython sys.path different from python sys.path

问题 I generally use IPython and only recently noticed that the the search path for imports is wrong in the regular python shell. From what I understand, sys.path inherits from PYTHONPATH (although I don't know where PYTHONPATH lives), is this different in IPython? I'm worried that this effecting installations. For instance I just tried pip install --upgrade gensim which failed because it couldn't resolve the scipy dependency, which I already have installed. So I dove a little bit deeper and found

How to import files in python using sys.path.append?

阅读更多关于 How to import files in python using sys.path.append?

问题 There are two directories on my desktop, DIR1 and DIR2 which contain the following files: DIR1: file1.py DIR2: file2.py myfile.txt The files contain the following: file1.py import sys sys.path.append('.') sys.path.append('../DIR2') import file2 file2.py import sys sys.path.append( '.' ) sys.path.append( '../DIR2' ) MY_FILE = "myfile.txt" myfile = open(MY_FILE) myfile.txt some text Now, there are two scenarios. The first works, the second gives an error. Scenario 1 I cd into DIR2 and run file2

How to import files in python using sys.path.append?

阅读更多关于 How to import files in python using sys.path.append?

How to import files in python using sys.path.append?

阅读更多关于 How to import files in python using sys.path.append?

Colored Python Prompt in Windows?

阅读更多关于 Colored Python Prompt in Windows?

问题 Here's my script that currently sets up my prompts for all of my computers (whether they're Windows, Red Hat, or OS X): import sys import datetime import platform if platform.system() is 'Windows': tealUText = "" tealText = "" greenText = "" defaultText = "" else: tealUText = "\001\033[4;36m\002" tealText = "\001\033[0;36m\002" greenText = "\001\033[0;32m\002" defaultText = "\001\033[0;0m\002" class ClockPS1(object): def __repr__(self): now = datetime.datetime.now() clock = str(now.strftime("

Why does writing to stdout in console append the number of characters written, in Python 3?

阅读更多关于 Why does writing to stdout in console append the number of characters written, in Python 3?

问题 I was just playing around with sys.stdout.write() in a Python console when I noticed that this gives some strange output. For every write() call the number of characters written, passed to the function respectively gets append to the output in console. >>> sys.stdout.write('foo bar') for example results in foo bar7 being printed out. Even passing an empty string results in an output of 0 . This really only happens in a Python console, but not when executing a file with the same statements.

python: sys is not defined

阅读更多关于 python: sys is not defined

问题 I have a piece of code which is working in Linux, and I am now trying to run it in windows, I import sys but when I use sys.exit(). I get an error, sys is not defined. Here is the begining part of my code try: import numpy as np import pyfits as pf import scipy.ndimage as nd import pylab as pl import os import heapq import sys from scipy.optimize import leastsq except ImportError: print "Error: missing one of the libraries (numpy, pyfits, scipy, matplotlib)" sys.exit() Why is sys not working?