掌握 Python 列表：您需要了解的基本技术

operating_systems = ["windows", "mac", "linux"]for os in operating_systems:    print(os)`

# outputwindowsmaclinux

operating_systems = ["windows", "mac", "linux"]for i in range(len(operating_systems)):    print(f"index {i}: {operating_systems[i]}")

# outputindex 0: windowsindex 1: macindex 2: linux

operating_systems = ["windows", "mac", "linux"]for index, os in enumerate(operating_systems):    print(f"index is {index} and value is {os}")

# outputindex is 0 and value is windowsindex is 1 and value is macindex is 2 and value is linux

operating_systems = ["windows", "mac", "linux"]i = 0 # inital condition, required to startwhile i < len(operating_systems):    print(f"while looping {i} got the value {operating_systems[i]}")    i = i + 1 # this is very important, dont forget about infinite loops

# outputwhile looping 0 got the value windowswhile looping 1 got the value macwhile looping 2 got the value linux

operating_systems = ["windows", "mac", "linux"]iterator = iter(operating_systems)while true:    try:        os = next(iterator)        print(f"consumed form iterator {os}")    except stopiteration:        print("consumed all from iterator")        break

# outputconsumed form iterator windowsconsumed form iterator macconsumed form iterator linuxconsumed all from iterator

# hack to avoid stopiterationiterator = iter(operating_systems)end_of_list = object()reached_end = falsewhile not reached_end:    os = next(iterator, end_of_list)# a predefined object as end of the list    if os != end_of_list:        print(os)    else:        reached_end = true

operating_systems = ["windows", "mac", "linux"]os_uppercase = [os.upper() for os in operating_systems]print(os_uppercase) 

# output['windows', 'mac', 'linux']

import itertoolsoperating_systems = ["windows", "mac", "linux"]for item in itertools.cycle(operating_systems):      print(item)# infinite cycling loopmake sure to have proper boundary condition to break

# outputwindowsmaclinuxwindowsmaclinuxwindowsmaclinuxwindowsmaclinuxwindows ....... infinite loop

operating_systems = ["windows", "mac", "linux"]mobile_operating_systems = ["android", "ios"]for os, mobile_os in zip(operating_systems,mobile_operating_systems):    print(os, mobile_os)

# outputwindows androidmac ios

operating_systems = ["windows", "mac", "linux"]for reversed_os in reversed(operating_systems):    print(reversed_os)

# Outputlinuxmacwindows