[英]How do you see the entire command history in interactive Python?
I'm working on the default python interpreter on Mac OS X, and I Cmd + K (cleared) my earlier commands.我正在使用 Mac OS X 上的默认 python 解释器,我使用 Cmd + K (清除)我之前的命令。 I can go through them one by one using the arrow keys.
我可以使用箭头键一一通过它们 go。 But is there an option like the --history option in bash shell, which shows you all the commands you've entered so far?
但是在 bash shell 中是否有类似 --history 选项的选项,它显示了您迄今为止输入的所有命令?
Code for printing the entire history:打印整个历史的代码:
One-liner (quick copy and paste):单行(快速复制和粘贴):
import readline; print('\n'.join([str(readline.get_history_item(i + 1)) for i in range(readline.get_current_history_length())]))
(Or longer version...) (或更长的版本...)
import readline
for i in range(readline.get_current_history_length()):
print (readline.get_history_item(i + 1))
One-liner (quick copy and paste):单行(快速复制和粘贴):
import readline; print '\n'.join([str(readline.get_history_item(i + 1)) for i in range(readline.get_current_history_length())])
(Or longer version...) (或更长的版本...)
import readline
for i in range(readline.get_current_history_length()):
print readline.get_history_item(i + 1)
Note : get_history_item()
is indexed from 1 to n.注意:
get_history_item()
的索引从 1 到 n。
Use readline.get_current_history_length()
to get the length, and readline.get_history_item()
to view each.使用
readline.get_current_history_length()
获取长度,并readline.get_history_item()
查看每个。
With python 3 interpreter the history is written to使用 python 3 解释器将历史写入
~/.python_history
If you want to write the history to a file:如果要将历史记录写入文件:
import readline
readline.write_history_file('python_history.txt')
The help function gives:帮助 function 给出:
Help on built-in function write_history_file in module readline:
write_history_file(...)
write_history_file([filename]) -> None
Save a readline history file.
The default filename is ~/.history.
In IPython %history -g
should give you the entire command history.在 IPython 中
%history -g
应该给你整个命令历史。 The default configuration also saves your history into a file named.python_history in your user directory.默认配置还将您的历史记录保存到用户目录中名为.python_history 的文件中。
Since the above only works for python 2.x for python 3.x (specifically 3.5) is similar but with a slight modification:由于上述仅适用于 python 2.x,因此 python 3.x(特别是 3.5)类似,但稍作修改:
import readline
for i in range(readline.get_current_history_length()):
print (readline.get_history_item(i + 1))
note the extra ()注意额外的 ()
(using shell scripts to parse.python_history or using python to modify the above code is a matter of personal taste and situation imho) (使用 shell 脚本解析.python_history 或使用 python 修改上述代码是个人喜好和情况恕我直言)
@Jason-V, it really help, thanks. @Jason-V,真的很有帮助,谢谢。 then, i found this examples and composed to own snippet.
然后,我找到了这个例子并组成了自己的片段。
#!/usr/bin/env python3
import os, readline, atexit
python_history = os.path.join(os.environ['HOME'], '.python_history')
try:
readline.read_history_file(python_history)
readline.parse_and_bind("tab: complete")
readline.set_history_length(5000)
atexit.register(readline.write_history_file, python_history)
except IOError:
pass
del os, python_history, readline, atexit
A simple function to get the history similar to unix/bash version.一个简单的 function 获取类似于 unix/bash 版本的历史记录。
Hope it helps some new folks.希望它可以帮助一些新人。
def ipyhistory(lastn=None):
"""
param: lastn Defaults to None i.e full history. If specified then returns lastn records from history.
Also takes -ve sequence for first n history records.
"""
import readline
assert lastn is None or isinstance(lastn, int), "Only integers are allowed."
hlen = readline.get_current_history_length()
is_neg = lastn is not None and lastn < 0
if not is_neg:
flen = len(str(hlen)) if not lastn else len(str(lastn))
for r in range(1,hlen+1) if not lastn else range(1, hlen+1)[-lastn:]:
print(": ".join([str(r if not lastn else r + lastn - hlen ).rjust(flen), readline.get_history_item(r)]))
else:
flen = len(str(-hlen))
for r in range(1, -lastn + 1):
print(": ".join([str(r).rjust(flen), readline.get_history_item(r)]))
Snippet: Tested with Python3.片段:使用 Python3 测试。 Let me know if there are any glitches with python2.
让我知道python2是否有任何故障。 Samples:
样品:
Full History:
ipyhistory()
完整历史:
ipyhistory()
Last 10 History:
ipyhistory(10)
最近 10 个历史记录:
ipyhistory(10)
First 10 History:
ipyhistory(-10)
前 10 个历史记录:
ipyhistory(-10)
Hope it helps fellas.希望对小伙伴有所帮助。
This should give you the commands printed out in separate lines:这应该会给你在单独的行中打印出来的命令:
import readline
map(lambda p:print(readline.get_history_item(p)),
map(lambda p:p, range(readline.get_current_history_length()))
)
Rehash of Doogle 's answer that doesn't printline numbers, but does allow specifying the number of lines to print. Doogle的答案的重新散列不打印行号,但允许指定要打印的行数。
def history(lastn=None):
"""
param: lastn Defaults to None i.e full history. If specified then returns lastn records from history.
Also takes -ve sequence for first n history records.
"""
import readline
assert lastn is None or isinstance(lastn, int), "Only integers are allowed."
hlen = readline.get_current_history_length()
is_neg = lastn is not None and lastn < 0
if not is_neg:
for r in range(1,hlen+1) if not lastn else range(1, hlen+1)[-lastn:]:
print(readline.get_history_item(r))
else:
for r in range(1, -lastn + 1):
print(readline.get_history_item(r))
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