<a href="http://www.reibang.com/p/54870e9541fc">總目錄</a>
課程頁(yè)面：https://www.codecademy.com/
內(nèi)容包含課程筆記和自己的擴(kuò)展折騰
Comparators
==!=<<=>>=
Boolean operators
- and
- true and true: true
- true and false: false
- false and false: false
- or
- true or true: true
- true or false: true
- false or false: false
- not
- not true: false
- not false: true
- 如果不加括號(hào)俄精，計(jì)算機(jī)處理就有順序（類(lèi)似orders of operations里面的pemdas），即是n->a->o.
Conditional Statement Syntax (if)
- 如果if后面的expression是True馏鹤，就執(zhí)行if后面的命令
if 6 + 1 != 10:
print "abc"
- 如果if后面的fuction return的是True, 就執(zhí)行if后面的命令
def addition():
if 1 + 1 == 2:
return True
#
def print_result():
if addition():
return "2"
#
print "1+1=" + print_result()
if ... else ...
- 對(duì)if進(jìn)行補(bǔ)充。
def addition(a, b):
if a >= b:
print "the 1st number %s is NOT less than the 2nd number %s" % (a, b)
else:
print "the 1st number %s is less than the 2nd number %s" % (a, b)
#
addition(3, 3)
addition(1, 6)
addition(6, 1)
"""
Output:
the 1st number 3 is NOT less than the 2nd number 3
the 1st number 1 is less than the 2nd number 6
the 1st number 6 is NOT less than the 2nd number 1
"""
if... elif... elif... else...
- elif滿足多個(gè)if的要求絮记。按順序執(zhí)行振乏。
def addition(a, b):
if a > b:
print "the 1st number %s is greater than the 2nd number %s" % (a, b)
elif a == b:
print "the 1st number %s is equal to the 2nd number %s" % (a, b)
else:
print "the 1st number %s is less than the 2nd number %s" % (a, b)
#
addition(3, 3)
addition(1, 6)
addition(6, 1)
"""
Output:
the 1st number 3 is equal to the 2nd number 3
the 1st number 1 is less than the 2nd number 6
the 1st number 6 is greater than the 2nd number 1
"""
