python菜鸟学习： 5.字符串的基本用法,进度条显示

# -*- coding: utf-8 -*-

import sys,time

str1 = "my name     is liyuzhoupan"
# 首字母大写
print(str1.capitalize())

# 统计字符串中的字符出现的次数
print(str1.count("n"))

# 自动补齐多少位，不够的用字符#替代
print(str1.center(50, "-"))

# 判断是否已字符“pan”为结尾
print(str1.endswith("pan"))

# 输出tab建
print(str1.expandtabs(tabsize=20))

# 格式化
print("my name is {name} ,age {age}".format(name="liyuzhoupan", age=23))

# 判断是否为阿拉伯字符或者数字
print("123adsf".isalnum())

# 判断是否为整数
print("123".isdigit())

# 判断是否大写
print("NAME".isupper())

# 字符转大写
print("name".upper())

# 字符转小写
print("NAME".lower())

# 替换字符串的中值
p = str.maketrans("abcdefj", "原来你是个人才")
print("my name is coffe".translate(p))

# 替换字符串中的值
print(str1.replace("m", "A", 1))

# 字符切割
print(str1.split(" "))
print(str1.split("  "))

#进度条展示

for i in range(10):
    sys.stdout.write(">")
    sys.stdout.flush()
    time.sleep(0.1)

for i in range(100):
    sys.stdout.write( "\r" +">" * i + "[{index}%]".format(index=i).rjust(100 - i, "_"))
    sys.stdout.flush()
    time.sleep(0.1)

for i in range(100):
    k = i + 1
    str = '>'*i+' '*(100-k)
    sys.stdout.write("\r"+str+'[%s%%]'%(i+1))
    sys.stdout.flush()
    time.sleep(0.1)