邏輯判斷與邏輯語(yǔ)句
- 對(duì)于─件事情正確與否（真假的判斷) √ X
- 根據(jù)判斷的結(jié)果做不同的事情，就是我們的邏輯業(yè)務(wù)
- 對(duì)于條件滿足的判斷語(yǔ)句，就是條件語(yǔ)句
- 一個(gè)邏輯語(yǔ)句是由條件語(yǔ)句和業(yè)務(wù)語(yǔ)句組合而成
if語(yǔ)句功能
判斷一個(gè)命題的真實(shí)性，如果命題為真( True )則執(zhí)行if的邏輯語(yǔ)句
if語(yǔ)句用法
用法:
if bool_result: # 語(yǔ)法塊
do # 業(yè)務(wù)代碼塊注意縮進(jìn)
參數(shù)︰
-
bool_result: 判斷結(jié)果的真假，布爾類型
do: 如果bool_result為T(mén)rue時(shí)執(zhí)行任意python代碼
返回值: if屬于關(guān)鍵字，沒(méi)有返回值
>>> insane_status = 'hunger
>>> if insane_status == 'hunger':
print( 'xiaomu invites Insane to dinner' )
xiaomu invites Insane to dinner
實(shí)戰(zhàn)
# coding:utf-8
info = 'my name is insane'
info_list = info.split()
print(info_list)
if info_list[0] == 'insane':
print(1)
info_list[0] = 'loafer'
if info_list[1] == 'insane':
print(2)
info_list[1] = 'loafer'
if info_list[2] == 'insane':
print(3)
info_list[2] = 'loafer'
if info_list[-1] == 'insane':
print(4)
info_list[-1] = 'loafer'
print(info_list)
info = ' '.join(info_list)
print(info)
info = 'my name is insane, i am a pythoner, i love python'
info_list = info.split()
if info_list[0] in ['python', 'i']:
info_list[0] = '*'
if info_list[1] == 'python' or info_list[1] == 'i':
info_list[1] = '*'
if info_list[2] == 'python' or info_list[2] == 'i':
info_list[2] = '*'
if info_list[3] == 'python' or info_list[3] == 'i':
info_list[3] = '*'
if info_list[4] == 'python' or info_list[4] == 'i':
info_list[4] = '*'
if info_list[5] == 'python' or info_list[5] == 'i':
info_list[5] = '*'
if info_list[6] == 'python' or info_list[6] == 'i':
info_list[6] = '*'
if info_list[7] == 'python' or info_list[7] == 'i':
info_list[7] = '*'
if info_list[8] == 'python' or info_list[8] == 'i':
info_list[8] = '*'
if info_list[9] == 'python' or info_list[9] == 'i':
info_list[9] = '*'
if info_list[-1] in ['python', 'i']:
info_list[-1] = '*'
print(info_list)
info = ' '.join(info_list)
print(info)
info = 'my name is insane'
print(len(info))
if len(info) > 10 and len(info) != 15:
print(info.replace('insane', 'loafer'))
if len(info) > 10 and len(info) != 17:
print(info.replace('name', 'iop'))
print('finish')
['my', 'name', 'is', 'insane']
4
['my', 'name', 'is', 'loafer']
my name is loafer
['my', 'name', 'is', 'insane,', '*', 'am', 'a', 'pythoner,', '*', 'love', '*']
my name is insane, * am a pythoner, * love *
17
my name is loafer
finish
Process finished with exit code 0
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