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創(chuàng)新互聯(lián)Python教程：詳解python迭代循環(huán)和用戶輸入
FOR(iteration) 循環(huán)
for 循環(huán)是 Python 中最常用的迭代機(jī)制。Python 中幾乎所有的結(jié)構(gòu)都能被 for 迭代。包括列表，元組，字典等。另一種常用的循環(huán)是 while 循環(huán)，但是 for 循環(huán)會(huì)是你最常見到的循環(huán)。
什么是 while 循環(huán)
while 循環(huán)會(huì)判斷一個(gè)初始條件，條件成立則執(zhí)行一次迭代，每次迭代完成后重新判斷條件，如果成立則繼續(xù)迭代，否則退出循環(huán)。
通用語(yǔ)法
# Set an initial condition. game_active = True # Set up the while loop. while game_active: # Run the game. # At some point, the game ends and game_active will be set to False. # When that happens, the loop will stop executing. # Do anything else you want done after the loop runs.
每次循環(huán)前都要初始化一條判斷為 true 的條件。
while 循環(huán)中包含條件判斷。
條件判斷為 true 則執(zhí)行循環(huán)內(nèi)代碼，不斷迭代，判斷。
判斷為 false 則退出循環(huán)。
示例
# The player's power starts out at 5.
power = 5
# The player is allowed to keep playing as long as their power is over 0.
while power > 0:
print("You are still playing, because your power is %d." % power)
# Your game code would go here, which includes challenges that make it
# possible to lose power.
# We can represent that by just taking away from the power.
power = power - 1
print("\nOh no, your power dropped to 0! Game Over.")用戶輸入
在 Python 中你可以利用 input() 函數(shù)接受用戶輸入。函數(shù)可以接受一條提示信息，等待用戶輸入。
通用用法
# Get some input from the user.
variable = input('Please enter a value: ')
# Do something with the value that was entered.示例
如下示例，提示用戶輸入名字，加入到名字列表中。
# Start with a list containing several names.
names = ['guido', 'tim', 'jesse']
# Ask the user for a name.
new_name = input("Please tell me someone I should know: ")
# Add the new name to our list.
names.append(new_name)
# Show that the name has been added to the list.
print(names) 網(wǎng)站名稱：創(chuàng)新互聯(lián)Python教程：詳解python迭代循環(huán)和用戶輸入
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