Python format 格式化 总结 大量 实例

测试format的不同用法

# 格式化{{}} 等于{}print('{{ hello {0} }}'.format('Kevin'))  # { hello Kevin }# test 同一个参数指定多个位置print('\n   同一个参数多个位置调用')print('Hi, I am {0}, my {1} is {0}'.format('jimmy', 'name')) # Hi, I am jimmy, my name is jimmy# 对齐与填充print('\n 对齐与填充')import mathprint('{:o<10}'.format(12345))  # 12345ooooo  左对齐 填充o 宽度10print('{:x>20.15f}'.format(math.pi))  # xxx3.141592653589793  右对齐 填充x 保留小数15 宽度20print('{:x> 20.15f}'.format(math.pi))  # xx 3.141592653589793  右对齐 填充x 保留小数15 宽度20print('{:x>+20.15f}'.format(math.pi))  # xx+3.141592653589793  右对齐 填充x 保留小数15 宽度20print('{:x>+20.15f}'.format(-3.141592653589793111))  # xx-3.141592653589793  右对齐 填充x 保留小数15 宽度20print('{:+^10d}'.format(123))  # +++123++++  中间对齐 填充+ 宽度10print('{:,}'.format(1234567890))  # 1,234,567,890  以逗号分隔的数字格式print('{:.2%}'.format(0.1))  # 10.00%   百分比格式 保留小数2# 通过字典设置参数print('\n   通过字典调用')dict2 = {'name': 'jimmy', 'gender': 'male'}print('my name is: {name}, gender is {gender}'.format(**dict2))  # 注意需要两个**在字典之前 my name is: jimmy, gender is maleprint('name:{d[name]},  gender:{d[gender]}'.format(d=dict2))  # 赋值给d  name:jimmy,  gender:maleprint('\n   序列化字典的输出')dict1 = {'jimmy': 100, 'tom': 88, 'penny': 99}for en, (k, v)  in enumerate(dict1.items(),1): # 把每一个 item 绑定序号, enumerate([迭代器], [开始的号码])    print('NO:{{{}}} ---- name: {:<6}  score: {:>3}'.format(en, k, v))# NO:{1} ---- name: jimmy   score: 100# NO:{2} ---- name: tom     score:  88# NO:{3} ---- name: penny   score:  99# 调用类的属性和方法print('\n   调用类的属性方法')class Teacher():    job = 'teacher'    def speak(self):        return 'good good study!!!'print('as a {t.job}, I have to talk you that {t.speak}'.format(t=Teacher()))  # 无法在{}里面调用 类的方法# as a teacher, I have to talk you that <bound method Teacher.speak of <__main__.Teacher object at 0x000002057CC8A240>>print('as a {}, I have to talk you that {}'.format(Teacher().job, Teacher().speak()))  # 无法调用 类的方法# as a teacher, I have to talk you that good good study!!!# 魔法参数print('\n   魔法参数')args = ['jimmy', 'penny']kwargs = {'name1': 'jack', 'name2': 'king'}print("this is {1} calling, I want to speak with {name2}, tell him {0} married with {name1}".format(*args, **kwargs))# this is penny calling, I want to speak with king, tell him jimmy married with jack# 调用函数print('\n   调用函数')def speak():    return 'do you think am I'print('{} very good?'.format(speak()))# do you think am I very good?# 设置格式print('\n   设置格式')text1 = 'I feel good'text1_formated = '{:-^30}'.format(text1)print(text1_formated)  # ---------I feel good----------text1_formated2 = '{:=^50}'.format(text1_formated)print(text1_formated2)  # ==========---------I feel good----------==========# 浓缩一下def text_formater(text):    text_formated = '{:=^50} '.format(' {:-^30} '.format(' ' + str(text) + ' '))    print(text_formated)text_formater('Tile 123')  # ========= ---------- Tile 123 ---------- =========