Records.md

title	toc	date	top
Records	true	2017-12-30	3

Get key name from Python KeyError exception

try:
    x2 = myDict['key2']
except KeyError as e:    
    print e.args[0]

How to print without newline or space?

print('.', end='')

String r

r is a prefix for string literals. This means, r"1\2\3\4" will not interpret \ as an escape when creating the string value, but keep \ as an actual character in the string. Thus, r"1\2\3\4" will have seven characters.

var = "1\2\3\4" will interpret backslashes as escapes, create the string '1\x02\x03\x04' (a four-character string), then assign this string to the variable var.

程序暂停

import time
time.sleep(amount) #单位s

捕获ctrl-C

使用KeyboardInterrupt捕获异常ref.

try:
    # DO THINGS
except KeyboardInterrupt:
    # quit
    sys.exit()