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def rule_for_5perc_discount_on_5k_purchase(cart, coupon_code, args):
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def rule_for_5perc_discount_on_5k_purchase(cart, coupon_code, args):
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    #Allow a user to use the coupon only once.
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    #Allow a user to use the coupon only once.
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    count_users_usage = get_coupon_usage_count_by_user(coupon_code, cart.userId)
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    count_users_usage = get_coupon_usage_count_by_user(coupon_code, cart.userId)
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    if count_users_usage > 0:
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    if count_users_usage > 0:
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        return cart
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        raise PromotionException(111, 'This Coupon can be used only once.')
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    #Allow only first 100 users to use the coupon
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    #Allow only first 100 users to use the coupon
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    count_coupon_usage = get_coupon_usage_count(coupon_code)
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    count_coupon_usage = get_coupon_usage_count(coupon_code)
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    if count_coupon_usage >= 100:
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    if count_coupon_usage >= 100:
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        return cart
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        raise PromotionException(112, 'This Coupon is now exhausted.')
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    if cart.lines:
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    if cart.lines:
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        total_selling_price = 0
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        total_selling_price = 0
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        for line in cart.lines:
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        for line in cart.lines: